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Fair Value Measurements Level 4 Fair Value Level 3 Roll Forward (Details) - Fair Value, Option, Eligible Item or Group [Domain] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities $ 59,128   $ 59,128     $ 59,384    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1,020   1,020     1,095    
Other Short-term Investments 3,278   3,278     4,883    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Marketable Securities, Fixed Maturities 553   553     488    
Trading Securities, Equity 11   11     11 [1]    
Available-for-sale Securities, Equity Securities 856   856     1,047    
Reinsurance Recoverables 22,891   22,891     22,920    
Separate Account Assets 131,489   131,489     134,702    
Assets, Fair Value Disclosure 192,758   192,758     199,248    
Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Assets, Fair Value Disclosure 553   553     488    
Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Assets, Fair Value Disclosure 0   0     348    
Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 471   471     106    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0   0     0    
Other Short-term Investments 588   588     349    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Marketable Securities, Fixed Maturities 0   0     0    
Trading Securities, Equity 11   11     11 [1]    
Available-for-sale Securities, Equity Securities 588   588     786    
Assets, Fair Value Disclosure 88,954   88,954     92,789    
Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 55,266   55,266     55,803    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 964   964     1,004    
Other Short-term Investments 2,690   2,690     4,534    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Marketable Securities, Fixed Maturities 467   467     396    
Trading Securities, Equity 0   0     0 [1]    
Available-for-sale Securities, Equity Securities 171   171     163    
Assets, Fair Value Disclosure 99,009   99,009     101,735    
Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   $ 813   $ 813     $ 762  
Available-for-sale Securities, Debt Securities 3,391   3,391     3,475    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 56   56     91    
Other Short-term Investments 0   0     0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 735 813 735 813 $ 602 578   $ 737
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [2]     (1)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] 7   7 4        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 224   262 265        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements (5)   (10) (1)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales (44)   (50) (163)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6] 5   6 4        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6] (53)   (57) (33)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7] 7   7 6        
Marketable Securities, Fixed Maturities 86   86     92    
Trading Securities, Equity 0   0     0 [1]    
Available-for-sale Securities, Equity Securities 97   97     98    
Assets, Fair Value Disclosure 4,795   4,795     4,724    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [3],[4],[5]   (1)            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [2] (1)              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   136            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   1            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   78            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 [6]   3            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]   8            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) [4],[7]   1            
Fair Value, Inputs, Level 3 [Member] | Limited Partnerships and Other Alternative Investments [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   67   67     107  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 230 67 230 67 190 189   108
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] 7   8 (5)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 33   33 30        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements 0   0 (24)        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6]       (42)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7] 7   0 (5)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [3],[4],[5]   (8)            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   0            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]   32            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) [4],[7]   (8)            
Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   139   139       193
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 86 139 86 139 85 92 206  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (2) 5 7          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 7 5 19          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements   (75)            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales (3) (2) (7)          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three (1)   (11)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (3) 10 (5)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings       15        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases       10        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements       75        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       4        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3       1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3       1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease)       20        
Fair Value, Inputs, Level 3 [Member] | Free standing Derivatives [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [8] 291 254 291 254 336 313 297 296
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5],[8] (67) (38) (49) (78)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases [8] (6) 2 34 13        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements [8] 5 (41) (40) (34)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6],[8] 10   10          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6],[8] 23 34 23 57        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7],[8] (57) (83) (50) (143)        
GMWB Reinsurance [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reinsurance Recoverables 50   50     56    
GMWB Reinsurance [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reinsurance Recoverables 0   0     0    
GMWB Reinsurance [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reinsurance Recoverables 0   0     0    
GMWB Reinsurance [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reinsurance Recoverables 50   50     56    
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reinsurance Recoverables 60   60     34    
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reinsurance Recoverables 0   0     0    
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reinsurance Recoverables 60   60     34    
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Reinsurance Recoverables 0   0     0    
Credit Risk Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Free standing Derivatives [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [8] 0 (1) 0 (1) (11) (9) 0 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5],[8] (6) (1) (1) 3        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases [8] (6)   (13) (6)        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6],[8] 23   23          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7],[8] (3) 1 2          
Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Free standing Derivatives [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [8] 3   3   0 0    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5],[8] (7)   (7)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6],[8] 10   10          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7],[8] (8)   (8)          
Equity Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Free standing Derivatives [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [8] 3 2 3 2 8 6 2 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5],[8] (5)   12 (1)        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements [8]     (15)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7],[8]     3          
Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Free standing Derivatives [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [8] (14) 21 (14) 21 (18) (7) 28 18
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5],[8] 9 (7) (2) (21)        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements [8] 5   (5)          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6],[8]       24        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7],[8] 7 (7) (12) (23)        
Other Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Free standing Derivatives [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [8] 9 15 9 15 11 12 16 17
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5],[8] (2) (1) (3) (2)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7],[8] (3) (1) (4) (1)        
Fair Value, Measurements, Recurring [Member] | Other Liabilities [Member] | Embedded Derivative Financial Instruments [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (3) (2) (3) (2) (3) (3) (2) (2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)   0            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements 0 0 0 0        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 0 0 0 0        
Fair Value, Measurements, Recurring [Member] | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (138) (20) (138) (20) (202) (165) (39) (48)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)   0            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 78 52 59 87        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements (14) (33) (32) (59)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 78 52 59 87        
Fair Value, Measurements, Recurring [Member] | Other Policyholder Funds and Benefits Payable [Member] | Equity Linked Notes [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (26) (22) (26) (22) (26) (26) (19) (18)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)   0            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 0 (3) 0 (4)        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements 0 0 0 0        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) 0 (3) 0 (4)        
Non-US [Member] | International Program Hedging Instruments [Member] | Fair Value, Inputs, Level 3 [Member] | Free standing Derivatives [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [8]   0   0     (5) (29)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5],[8]   12   28        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases [8]       9        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements [8]   (41)   (41)        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6],[8]   34   33        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7],[8]   (35)   (18)        
Non-US [Member] | Fair Value, Measurements, Recurring [Member] | Other Policyholder Funds and Benefits Payable [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   0   0     2 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)   0            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings   0   0        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements   (2)   (3)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease)   0   0        
Non-US [Member] | Fair Value, Measurements, Recurring [Member] | Other Policyholder Funds and Benefits Payable [Member] | Other Guaranteed Living Benefits [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   0   0     2 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)   0            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings   0   0        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements   (2)   (3)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease)   0   0        
UNITED STATES | Reinsurance Recoverable [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 50 31 50 31 65 56 30 29
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] (20) (7) (15) (11)        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements 5 8 9 13        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7] (20) (7) (15) (11)        
UNITED STATES | US GMWB Hedging Instruments [Member] | Fair Value, Inputs, Level 3 [Member] | Free standing Derivatives [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [8] 125 97 125 97 159 170 123 146
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5],[8] (34) (26) (25) (60)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases [8]       4        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements [8]     (20) 7        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7],[8] (32) (26) (16) (76)        
UNITED STATES | US Macro Hedge Program [Member] | Fair Value, Inputs, Level 3 [Member] | Free standing Derivatives [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [8] 165 120 165 120 187 141 133 139
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5],[8] (22) (15) (23) (25)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases [8]   2 47 6        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7],[8] (18) (15) (15) (25)        
UNITED STATES | Other Policyholder Funds and Benefits Payable [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (112) 2 (112) 2 (176) (139) (24) (36)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] 78 55 59 91        
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements (14) (29) (32) (53)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7] 78 55 59 91        
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   3,774   3,774       4,154
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 3,391 3,774 3,391 3,774 3,700 3,475 4,063  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [2] (24) 10 38          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] 1 12 7          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 206 239 590          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements (135) (146) (204)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales (109) (136) (163)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6] 55 138 204          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6] (303) (406) (466)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7] (1) (5) (5)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [3],[4],[5]       18        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [2]       36        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases       500        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements       240        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       356        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 [6]       277        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]       615        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) [4],[7]       (24)        
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [8] 97 80 97 80 102 98 79 77
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [2] (1) 1 (4) 5        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] 11   12 (2)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases [8] 4   12          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales [8] (14)   (16)          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6] (5)   (5)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7]     1 (2)        
US Treasury Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 4,166   4,166     3,872    
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 471   471     106    
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 3,695   3,695     3,766    
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Residential Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 3,969   3,969     3,918    
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 2,429   2,429     2,637    
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,540   1,540     1,281    
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,540   1,540     1,281    
Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   1,295   1,295       1,272
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 1,540 1,295 1,540 1,295 1,463 1,281 1,328  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [2] 1 (4)            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] (1) 9 2          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 135 116 445          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements (47) (50) (93)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales (54) (65) (85)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6] 43   47          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6]   (39) (53)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7]   (1)            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [3],[4],[5]       8        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [2]       10        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases       263        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements       96        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       107        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]       55        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) [4],[7]       (1)        
Corporate Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 26,610   26,610     27,359    
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 25,679   25,679     26,319    
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 931   931     1,040    
Corporate Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   1,205   1,205       1,274
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 931 1,205 931 1,205 1,112 1,040 1,243  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [2] (14) 4 42          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5]   (4) 4          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 18 54 23          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements (30) (26) (29)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales (26) (33) (33)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6] 12 133 151          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6] (141) (166) (175)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7] 1 (4) (1)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [3],[4],[5]       (18)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [2]       28        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases       91        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements       25        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       111        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 [6]       200        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]       234        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) [4],[7]       (21)        
US States and Political Subdivisions Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 12,298   12,298     12,871    
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 12,249   12,249     12,805    
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 49   49     66    
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   63   63       69
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 49 63 49 63 64 66 78  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [2] (3) 1 5          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] 1   (1)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases   4            
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements (13)   (13)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   (1)            
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6]   (19)            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [2]       4        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases       16        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]       25        
Collateralized Debt Obligations [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities [9] 3,218   3,218     2,841    
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 2,654   2,654     2,218    
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 564   564     623    
Collateralized Debt Obligations [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   612   612       664
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 564 612 564 612 584 623 712  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [2] (2) 8 (17)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] (2)   4          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements (16) (21) (25)          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6]   (87) (47)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7] (2)   (4)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [2]       8        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements       35        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 [6]       72        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]       97        
Commercial Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 4,664   4,664     4,415    
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 4,450   4,450     4,131    
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 214   214     284    
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 214   214     284    
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   471   471       663
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 214 471 214 471 268 284 592  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [2]   (2) 3          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] 2 7 (1)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 18 25 39          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements (25) (47) (38)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales (6) (16) (6)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6]   5 5          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6] (43) (93) (68)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7] (1)   (1)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [3],[4],[5]       30        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [2]       (24)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases       90        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements       80        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       103        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 [6]       5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]       110        
Asset-backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 2,890   2,890     2,472    
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 2,837   2,837     2,350    
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 53   53     122    
Asset-backed Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   73   73       147
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 53 73 53 73 161 122 56  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [2] (2) 1 2          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] 1   (1)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 28 37 71          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements (3) (1) (4)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales (13) (18) (13)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6]     1          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Transfers Out of Level Three [6] (119) (2) (123)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [4],[7] 1   1          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [2]       3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases       37        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements       2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       18        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]       94        
Foreign Government Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,313   1,313     1,636    
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 0   0     0    
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,273   1,273     1,577    
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 40   40     59    
Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   55   55       $ 65
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 40 55 40 55 $ 48 $ 59 $ 54  
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [2] (4) 2 3          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 7 3 12          
Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset Netted Against Liability Settlements (1) (1) (2)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales $ (10) $ (3) $ (26)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [3],[4],[5]       (2)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [2]       7        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases       3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements       2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales       16        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) [4],[7]       $ (2)        
[1] [1]Included in other investments on the Condensed Consolidated Balance Sheets.
[2] [3]All amounts are before income taxes and amortization of DAC.
[3] [1]The Company classifies gains and losses on GMWB reinsurance derivatives and GMWB embedded derivatives as unrealized gains (losses) for purposes of disclosure in this table because it is impracticable to track on a contract-by-contract basis the realized gains (losses) for these derivatives and embedded derivatives.
[4] [2]All amounts in these rows are reported in net realized capital gains (losses). The realized/unrealized gains (losses) included in net income for separate account assets are offset by an equal amount for separate account liabilities, which results in a net zero impact on net income for the Company. All amounts are before income taxes and amortization of DAC.
[5] [6]Includes both market and non-market impacts in deriving realized and unrealized gains (losses).
[6] [4]Transfers in and/or (out) of Level 3 are primarily attributable to the availability of market observable information and the re-evaluation of the observability of pricing inputs.
[7] [7]Amounts presented are for Level 3 only and therefore may not agree to other disclosures included herein.
[8] [5]Derivative instruments are reported in this table on a net basis for asset (liability) positions and reported in the Condensed Consolidated Balance Sheets in other investments and other liabilities.
[9] Gross unrealized gains (losses) exclude the fair value of bifurcated, embedded derivative features of certain securities. Subsequent changes in value are recorded in net realized capital gains (losses).