v3.8.0.1
Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity securities      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period $ 265 $ 266  
Total gains (losses) (realized/unrealized):      
Included in other comprehensive income (loss) 17 (75) $ 1
Net investment income 0 0 0
Purchases 33 99  
Sales (35) (79)  
Issuances 0 0  
Settlements 0 (13)  
Foreign currency translation 3 13  
Other (1) 0  
Transfers into Level 3 7 9  
Transfers out of Level 3 (1) (7)  
Fair Value, end of period 290 265 266
Equity securities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 2 52 15
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings (4) 0 (3)
Equity securities | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings   0  
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings   0  
Notes issued by consolidated VIEs      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period (1,839) (8,597)  
Total gains (losses) (realized/unrealized):      
Net investment income 0 0 0
Purchases 0 0  
Sales 0 0  
Issuances 0 (2,187)  
Settlements 0 697  
Foreign currency translation 0 0  
Other 647 8,285  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period (1,196) (1,839) (8,597)
Notes issued by consolidated VIEs | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (4) (23) 287
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings (4) (23) 287
Notes issued by consolidated VIEs | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings   (14) 146
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings   (14) 146
Notes issued by consolidated VIEs | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0 0
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 0    
Total gains (losses) (realized/unrealized):      
Included in other comprehensive income (loss) 0    
Net investment income 0    
Purchases 42    
Sales 0    
Issuances 0    
Settlements 0    
Foreign currency translation 0    
Other 10    
Transfers into Level 3 0    
Transfers out of Level 3 0    
Fair Value, end of period 52 0  
Fixed maturities | U.S. Treasury securities and obligations of U.S. government authorities and agencies | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0    
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0    
Fixed maturities | U.S. states      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 5 6  
Total gains (losses) (realized/unrealized):      
Included in other comprehensive income (loss) 0 0  
Net investment income 0 0  
Purchases 7 0  
Sales 0 0  
Issuances 0 0  
Settlements 0 (1)  
Foreign currency translation 0 0  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 (7) 0  
Fair Value, end of period 5 5 6
Fixed maturities | U.S. states | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0  
Fixed maturities | Foreign government bonds      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 124 123  
Total gains (losses) (realized/unrealized):      
Included in other comprehensive income (loss) (1) (3) (3)
Net investment income 0 0 0
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements 0 0  
Foreign currency translation 3 3  
Other 0 0  
Transfers into Level 3 39 1  
Transfers out of Level 3 (17) 0  
Fair Value, end of period 148 124 123
Fixed maturities | Foreign government bonds | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0 0
Fixed maturities | Corporate securities      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 2,173 1,222  
Total gains (losses) (realized/unrealized):      
Included in other comprehensive income (loss) (22) 76 7
Net investment income 19 11 17
Purchases 525 318  
Sales (173) (18)  
Issuances 0 0  
Settlements (781) (323)  
Foreign currency translation 7 5  
Other (55) 0  
Transfers into Level 3 1,498 1,486  
Transfers out of Level 3 (322) (473)  
Fair Value, end of period 2,776 2,173 1,222
Fixed maturities | Corporate securities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (93) (131) (95)
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings (154) (110) (87)
Fixed maturities | Structured securities      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 4,555 4,269  
Total gains (losses) (realized/unrealized):      
Included in other comprehensive income (loss) 11 (23) (40)
Net investment income 7 13 20
Purchases 4,967 3,582  
Sales (645) (444)  
Issuances 0 0  
Settlements (2,756) (700)  
Foreign currency translation 38 35  
Other (2) 159  
Transfers into Level 3 3,933 1,787  
Transfers out of Level 3 (3,463) (4,133)  
Fair Value, end of period 6,715 4,555 4,269
Fixed maturities | Structured securities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 70 10 41
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0 4
Trading account assets | Foreign government bonds      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 227 34  
Total gains (losses) (realized/unrealized):      
Net investment income 5 1  
Purchases 0 201  
Sales 0 0  
Issuances 0 0  
Settlements (4) (4)  
Foreign currency translation 0 0  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 223 227 34
Trading account assets | Foreign government bonds | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0  
Trading account assets | Foreign government bonds | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings (5) (5)  
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings (5) (5)  
Trading account assets | Corporate securities      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 188 203  
Total gains (losses) (realized/unrealized):      
Net investment income 3 2 1
Purchases 154 11  
Sales (7) (3)  
Issuances 0 0  
Settlements (119) (41)  
Foreign currency translation 0 0  
Other 0 (15)  
Transfers into Level 3 383 151  
Transfers out of Level 3 (18) (111)  
Fair Value, end of period 552 188 203
Trading account assets | Corporate securities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0 0
Trading account assets | Corporate securities | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings (32) (9) (28)
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings (33) (10) 9
Trading account assets | Structured securities      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 332 603  
Total gains (losses) (realized/unrealized):      
Net investment income 1 2 1
Purchases 656 185  
Sales (25) (49)  
Issuances 0 0  
Settlements (355) (122)  
Foreign currency translation 5 (2)  
Other 1 141  
Transfers into Level 3 602 252  
Transfers out of Level 3 (428) (666)  
Fair Value, end of period 789 332 603
Trading account assets | Structured securities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0 0
Trading account assets | Structured securities | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 (12) (7)
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 3 (4) (7)
Trading account assets | Equity securities      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 487 589  
Total gains (losses) (realized/unrealized):      
Net investment income 0 0 0
Purchases 28 20  
Sales (17) (65)  
Issuances 0 0  
Settlements (47) (108)  
Foreign currency translation 6 31  
Other 29 14  
Transfers into Level 3 31 28  
Transfers out of Level 3 (33) (30)  
Fair Value, end of period 509 487 589
Trading account assets | Equity securities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0 0
Trading account assets | Equity securities | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings 25 8 (15)
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 38 3 6
Trading account assets | All other activity      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 1 5  
Total gains (losses) (realized/unrealized):      
Net investment income 0 0 0
Purchases 46 0  
Sales 0 0  
Issuances 0 0  
Settlements (39) 0  
Foreign currency translation 0 0  
Other 0 (5)  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 8 1 5
Trading account assets | All other activity | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0 0
Trading account assets | All other activity | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 1 (1)
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 1 (1)
Other long-term investments      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 7 49  
Total gains (losses) (realized/unrealized):      
Included in other comprehensive income (loss) 0 0 0
Net investment income 0 (1) (1)
Purchases 0 1  
Sales 0 0  
Issuances 39 0  
Settlements (1) 0  
Foreign currency translation (1) 0  
Other 77 (33)  
Transfers into Level 3 14 0  
Transfers out of Level 3 0 (8)  
Fair Value, end of period 136 7 49
Other long-term investments | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 1 (1) 21
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 (1) 19
Other long-term investments | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings   0  
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings   0  
Short-term investments      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 1 0  
Total gains (losses) (realized/unrealized):      
Included in other comprehensive income (loss) 0 0  
Net investment income 0 0  
Purchases 30 1  
Sales 0 0  
Issuances 0 0  
Settlements (23) 0  
Foreign currency translation 0 0  
Other (1) 0  
Transfers into Level 3 1 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 8 1 0
Short-term investments | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0  
Short-term investments | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings   0  
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings   0  
Cash equivalents      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 0    
Total gains (losses) (realized/unrealized):      
Included in other comprehensive income (loss) 0    
Net investment income 2    
Purchases 93    
Sales 0    
Issuances 0    
Settlements (99)    
Foreign currency translation 0    
Other 0    
Transfers into Level 3 4    
Transfers out of Level 3 0    
Fair Value, end of period 0 0  
Cash equivalents | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0    
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0    
Other assets      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 0 7  
Total gains (losses) (realized/unrealized):      
Included in other comprehensive income (loss) 0 0 0
Net investment income 0 0 0
Purchases 33 23  
Sales 0 0  
Issuances 0 0  
Settlements 0 0  
Foreign currency translation 0 0  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 13 0 7
Other assets | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (20) (30) 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings (21) (30) 2
Other assets | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings   0  
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings   0  
Separate accounts assets      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 1,849 1,995  
Total gains (losses) (realized/unrealized):      
Net investment income 2 17 24
Purchases 1,122 555  
Sales (98) (141)  
Issuances 0 0  
Settlements (725) (485)  
Foreign currency translation 0 0  
Other 0 0  
Transfers into Level 3 353 344  
Transfers out of Level 3 (462) (459)  
Fair Value, end of period 2,122 1,849 1,995
Separate accounts assets | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 1 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0 0
Separate accounts assets | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings   0 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings   0 0
Separate accounts assets | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 81 22 (38)
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 78 3 318
Future policy benefits      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period (8,238) (8,434)  
Total gains (losses) (realized/unrealized):      
Net investment income 0 0 0
Purchases 0 0  
Sales 0 0  
Issuances (1,117) (1,056)  
Settlements 0 0  
Foreign currency translation (2) 0  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period (8,720) (8,238) (8,434)
Future policy benefits | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 637 1,252 717
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 372 1,046 485
Future policy benefits | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings   0 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings   0 0
Future policy benefits | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings 0 0 0
Other liabilities      
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period (22) (2)  
Total gains (losses) (realized/unrealized):      
Net investment income 0 0 0
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements 4 (6)  
Foreign currency translation 0 0  
Other 5 (6)  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period (50) (22) (2)
Other liabilities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (37) (8) 1
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings (37) (9) 1
Other liabilities | Other income      
Total gains (losses) (realized/unrealized):      
Included in earnings   0 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings   0 0
Other liabilities | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets still held included in earnings:      
Included in earnings $ 0 $ 0 $ 0