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Fair Value Measurements Level 4 Fair Value Level 3 Roll Forward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Equity Securities, Amortized Cost Basis $ 772   $ 772     $ 1,135    
Available-for-sale Securities, Debt Securities 61,241   61,241     59,196    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1,432   1,432     1,086    
Other Short-term Investments 2,497   2,497     1,843    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Marketable Securities, Fixed Maturities 411   411     503    
Trading Securities, Equity 11   11     11 [1]    
Available-for-sale Securities, Equity Securities 827   827     1,121    
Separate Account Assets 117,851   117,851     120,123    
Assets, Fair Value Disclosure 180,046   180,046     181,633    
Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Assets, Fair Value Disclosure 411   411     503    
Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Assets, Fair Value Disclosure 0   0     282    
Fair Value, Inputs, Level 1 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 509   509     740    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0   0     0    
Other Short-term Investments 457   457     333    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Marketable Securities, Fixed Maturities 0   0     2    
Trading Securities, Equity 11   11     11 [1]    
Available-for-sale Securities, Equity Securities 564   564     874    
Assets, Fair Value Disclosure 75,346   75,346     80,070    
Fair Value, Inputs, Level 2 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 56,963   56,963     55,143    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1,131   1,131     900    
Other Short-term Investments 2,040   2,040     1,510    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Marketable Securities, Fixed Maturities 405   405     485    
Trading Securities, Equity 0   0     [1]    
Available-for-sale Securities, Equity Securities 166   166     154    
Assets, Fair Value Disclosure 99,380   99,380     95,907    
Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 3,769   3,769     3,313    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 301   301     186    
Other Short-term Investments 0   0     0    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 171 $ 286 171 $ 286 $ 154 139 $ 137 $ 112
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4]     0 1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] 3 (1) 7 (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 22 222 61 260        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (3) (5) (9) (10)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 6 19 16 25        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 [6] 3 5 6 6        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 2 [6] 53 17 [6] 57 [6]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7]     0 1        
Marketable Securities, Fixed Maturities 6   6     16    
Trading Securities, Equity 0   0     [1]    
Available-for-sale Securities, Equity Securities 97   97     93    
Assets, Fair Value Disclosure 4,289   4,289     3,810    
Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 6 86 6 86 14 16 85 92
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4] 1 (2) (1) (7)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1 7 6 19        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (1)   (2)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 3 3 3 7        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 6 [8] 1 [6] 10 [6] 11 [6]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7]   (3) (1) (5)        
Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                
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, Transfers into Level 3 [6],[8]   10   10        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [6],[8] 6 23 6 23        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [8] 279 291 279 291 271 267 336 313
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [2],[3],[4],[8] 2 (67) (8) (49)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements [8]   (5) (2) (40)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases [8]   (6) 16 34        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7],[8] 2 (57) (8) (50)        
GMWB Reinsurance [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 106   106          
Credit Risk Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                
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, Transfers out of Level 3 [6]   23   23        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   0   0     (11) (9)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [2],[3],[4]   (6)   (1)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases   (6)   (13)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7]   (3)   2        
Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                
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, Transfers into Level 3 [6]   10   10        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   3   3     0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [2],[3],[4]   (7)   (7)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7]   (8)   (8)        
Equity Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 1 3 1 3 5 0 8 6
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [2],[3],[4] (4) (5) (15) 12        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements       (15)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases     16          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7] (4)   (15) 3        
Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (32) (14) (32) (14) (28) (22) (18) (7)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [2],[3],[4] (4) 9 (10) (2)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements   (5)   (5)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7] (4) 7 (10) (12)        
Other Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 4 9 4 9 5 7 11 12
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [2],[3],[4] (1) (2) (3) (3)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7] (1) (3) (3) (4)        
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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (28)   (28)          
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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5]   0            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value   (3)   (3)     (3) (3)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings [2],[3],[4]   0   0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements   0   0        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7]   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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5]   0            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (440) (138) (440) (138) (386) (288) (202) (165)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings [2],[3],[4] (38) 78 (119) 59        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) [5]     0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (16) (14) (33) (32)        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7] (38) 78 (119) 59        
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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5]   0            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (28) (26) (28) (26) (25) (26) (26) (26)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings [2],[3],[4] (3) 0 (2) 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) [5]     0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 0 0 0 0        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7] (3) 0 (2) 0        
UNITED STATES | Reinsurance Recoverable [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 106 50 106 50 99 83 65 56
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4] 3 (20) 16 (15)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 4 5 (7) 9        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7] 3 (20) 16 (15)        
UNITED STATES | US GMWB Hedging Instruments [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                
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, Transfers out of Level 3 [6] 6   6          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 165 125 165 125 144 135 159 170
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [2],[3],[4] 15 (34) 24 (25)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements       (20)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7] 15 (32) 24 (16)        
UNITED STATES | US Macro Hedge Program [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 141 165 141 165 145 147 187 141
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [2],[3],[4] (4) (22) (4) (23)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements     (2)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases       47        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7] (4) (18) (4) (15)        
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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (412) (112) (412) (112) (361) (262) (176) (139)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings [2],[3],[4] (35) 78 (117) 59        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 16 14 33 32        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7] (35) 78 (117) 59        
Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Equity Securities, Amortized Cost Basis           293    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Available-for-sale Securities, Equity Securities 0   0     282    
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 3,769 3,391 3,769 3,391 3,554 3,313 3,700 3,475
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4] (1) 1 (15) (7)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] 40 (24) 17 (38)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 165 206 582 590        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (226) (135) (300) (204)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 78 109 105 163        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 488 [8] 55 [6] 553 [6] 204 [6]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 173 [8] 303 [6] 276 [6] 466 [6]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7] (1) (1) (2) (5)        
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 97 97 97 97 92 93 102 98
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4] 1 11   12        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] 5 (1) 7 (4)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2 4 2 12        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 3 14 5 16        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]   5   5        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7]       1        
US Treasury Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 4,619   4,619     4,665    
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 509   509     740    
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 4,110   4,110     3,925    
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 4,826   4,826     4,046    
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 2,953   2,953     2,424    
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 1,873   1,873     1,622    
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 1,873   1,873     1,622    
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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1,873 1,540 1,873 1,540 1,886 1,622 1,463 1,281
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4]   (1)   (2)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] 10 1 (4)          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 97 135 430 445        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (101) (47) (158) (93)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   54   85        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 3 [8] 43 [6] 5 [6] 47 [6]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 22 [8]   22 [6] 53 [6]        
Corporate Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 27,158   27,158     26,802    
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 26,022   26,022     25,948    
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 1,136   1,136     854    
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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1,136 931 1,136 931 834 854 1,112 1,040
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4] (1)   (14) (4)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] 19 (14) 12 (42)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 37 18 67 23        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (50) (30) (55) (29)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 66 26 91 33        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 455 [8] 12 [6] 513 [6] 151 [6]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 92 [8] 141 [6] 150 [6] 175 [6]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7] (1) 1 (1) (1)        
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 12,611   12,611     12,121    
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 12,521   12,521     12,072    
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 90   90     49    
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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 90 49 90 49 50 49 64 66
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4]   1   1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] 4 (3) 5 (5)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 20   20          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   (13)   (13)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 16 [8]   16 [6]          
Collateralized Debt Obligations [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities [9] 2,867   2,867     3,038    
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 2,389   2,389     2,497    
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 478   478     541    
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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 478 564 478 564 542 541 584 623
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4] (1) (2) (1) (4)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] (2) (2) (2) 17        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (61) (16) (60) (25)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]       47        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7]   (2)   (4)        
Commercial Mortgage Backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 5,195   5,195     4,717    
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 5,116   5,116     4,567    
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 79   79     150    
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 58   58     122    
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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 79 214 79 214 134 150 268 284
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4]   2 (1) 1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] 5   (3) (3)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 10 18 50 39        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (9) (25) (18) (38)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 3 6 3 6        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 1 [8]   1 [6] 5 [6]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 59 [8] 43 [6] 97 [6] 68 [6]        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7]   (1) (1) (1)        
Asset-backed Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 2,777   2,777     2,499    
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 2,736   2,736     2,462    
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 41   41     37    
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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 41 53 41 53 32 37 161 122
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4]   1   1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5]   (2)   (2)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   28   71        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (4) (3) (7) (4)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   13   13        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 13 [8]   18 [6] 1 [6]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 [6]   119 7 123        
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) [3],[7]   1   1        
Foreign Government Debt Securities [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,188   1,188     1,308    
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 1,116   1,116     1,248    
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 72   72     60    
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, Calculation [Roll Forward]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 72 40 72 40 $ 76 $ 60 $ 48 $ 59
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings [2],[3],[4] 1   1          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] 4 (4) 9 (3)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1 7 15 12        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (1) (1) (2) (2)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales $ 9 $ 10 $ 11 $ 26        
[1] [1]Included in other investments on the Condensed Consolidated Balance Sheets.
[2] [1]The Company classifies realized and unrealized gains (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.
[3] [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.
[4] [6]Includes both market and non-market impacts in deriving realized and unrealized gains (losses).
[5] [3]All amounts are before income taxes and amortization of DAC.
[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 derivatives within certain securities. Subsequent changes in value are recorded in net realized capital gains (losses).