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Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period $ 633 $ 671  
Purchases 59 79  
Sales (50) (52)  
Issuances 0 0  
Settlements (6) (85)  
Other 11 1  
Transfers into Level 3 0 1  
Transfers out of Level 3 (1) (24)  
Fair Value, end of period 660 633 $ 671
Total gains (losses) (realized/unrealized):      
Included in earnings 14 42  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 11 34  
Equity securities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Equity securities | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings 14 42 (6)
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 11 34 (19)
Equity securities | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Equity securities | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Equity securities | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Assets supporting experience-rated contractholder liabilities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Assets supporting experience-rated contractholder liabilities | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings (22) (4) (39)
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (22) (5) (38)
Assets supporting experience-rated contractholder liabilities | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Assets supporting experience-rated contractholder liabilities | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Assets supporting experience-rated contractholder liabilities | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 4 9 8
Assets supporting experience-rated contractholder liabilities | Foreign government bonds      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 24 225  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements (5) (5)  
Other 0 (196)  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 19 24 225
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0  
Assets supporting experience-rated contractholder liabilities | Corporate securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 637 444  
Purchases 6 146  
Sales (9) 0  
Issuances 0 0  
Settlements (182) (189)  
Other (19) 196  
Transfers into Level 3 99 46  
Transfers out of Level 3 (33) (10)  
Fair Value, end of period 482 637 444
Total gains (losses) (realized/unrealized):      
Included in earnings (17) 4  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (25) (6)  
Assets supporting experience-rated contractholder liabilities | Structured securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 69 149  
Purchases 191 29  
Sales 0 0  
Issuances 0 0  
Settlements (33) (35)  
Other 0 0  
Transfers into Level 3 1 0  
Transfers out of Level 3 (113) (74)  
Fair Value, end of period 114 69 149
Total gains (losses) (realized/unrealized):      
Included in earnings (1) 0  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 3 0  
Assets supporting experience-rated contractholder liabilities | Equity securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 0 1  
Purchases 0 0  
Sales 0 (2)  
Issuances 0 0  
Settlements 0 0  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 0 0 1
Total gains (losses) (realized/unrealized):      
Included in earnings 0 1  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 1  
Assets supporting experience-rated contractholder liabilities | All other activity      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 0 0  
Purchases 134 8  
Sales 0 0  
Issuances 0 0  
Settlements (5) (8)  
Other (2) 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 (107) 0  
Fair Value, end of period 20 0 0
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0  
Other invested assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 567 263  
Purchases 209 341  
Sales 0 0  
Issuances 4 0  
Settlements (5) (42)  
Other (415) (6)  
Transfers into Level 3 8 0  
Transfers out of Level 3 (9) 0  
Fair Value, end of period 366 567 263
Total gains (losses) (realized/unrealized):      
Included in earnings 7 11  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 7 (1)  
Other invested assets | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 (1) 4
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 (1) 2
Other invested assets | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings 7 12 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 7 0 1
Other invested assets | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Other invested assets | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Other invested assets | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Short-term Investments      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 155 89  
Purchases 327 597  
Sales 0 0  
Issuances 0 0  
Settlements (115) (526)  
Other (48) (5)  
Transfers into Level 3 0 0  
Transfers out of Level 3 (143) 0  
Fair Value, end of period 177 155 89
Total gains (losses) (realized/unrealized):      
Included in earnings 1 0  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (1) 0  
Short-term Investments | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 1 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (1) 0 (1)
Short-term Investments | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Short-term Investments | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Short-term Investments | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Short-term Investments | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Cash equivalents      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 131 77  
Purchases 0 131  
Sales 0 0  
Issuances 0 0  
Settlements 0 (77)  
Other (130) 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 1 131 77
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0  
Cash equivalents | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 (1)
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Cash equivalents | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Cash equivalents | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Cash equivalents | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Cash equivalents | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Other assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 113 25  
Purchases 69 44  
Sales 0 0  
Issuances 0 0  
Settlements (1) 0  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 268 113 25
Total gains (losses) (realized/unrealized):      
Included in earnings 87 44  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 88 44  
Other assets | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 87 44 (34)
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 88 44 (34)
Other assets | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Other assets | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Other assets | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Other assets | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Separate accounts assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 1,717 1,534  
Purchases 242 346  
Sales (71) (111)  
Issuances 0 0  
Settlements (84) (144)  
Other 0 0  
Transfers into Level 3 43 55  
Transfers out of Level 3 (169) (147)  
Fair Value, end of period 1,821 1,717 1,534
Total gains (losses) (realized/unrealized):      
Included in earnings 143 184  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 157 170  
Separate accounts assets | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Separate accounts assets | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Separate accounts assets | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 143 180 (66)
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 157 170 (52)
Separate accounts assets | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Separate accounts assets | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 4 2
Future policy benefits      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period (12,831) (8,926)  
Purchases 0 0  
Sales 0 0  
Issuances (1,304) (1,221)  
Settlements 0 0  
Other 93 1  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period (18,879) (12,831) (8,926)
Total gains (losses) (realized/unrealized):      
Included in earnings (4,837) (2,685)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (5,263) (2,999)  
Future policy benefits | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (4,837) (2,685) 947
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (5,263) (2,999) 611
Future policy benefits | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 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/liabilities still held:      
Included in earnings 0 0 0
Future policy benefits | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Future policy benefits | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Policyholders’ account balances      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period (1,316) (56)  
Purchases 0 0  
Sales 0 0  
Issuances (370) (324)  
Settlements 0 0  
Other 0 (3)  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period (1,914) (1,316) (56)
Total gains (losses) (realized/unrealized):      
Included in earnings (228) (933)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (155) (917)  
Policyholders’ account balances | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (228) (933) 30
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (155) (917) 30
Policyholders’ account balances | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Policyholders’ account balances | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Policyholders’ account balances | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Policyholders’ account balances | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Other liabilities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period (105) 0  
Purchases 0 0  
Sales 0 0  
Issuances 0 (100)  
Settlements 0 0  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 0 (105) 0
Total gains (losses) (realized/unrealized):      
Included in earnings 105 (5)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 105 (5)  
Other liabilities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 2
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 3
Other liabilities | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings 105 (5) 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 105 (5) 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/liabilities still held:      
Included in earnings 0 0 0
Other liabilities | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Other liabilities | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Notes issued by consolidated VIEs      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period (800) (595)  
Purchases 0 0  
Sales 0 0  
Issuances 0 (858)  
Settlements 0 638  
Other 775 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 0 (800) (595)
Total gains (losses) (realized/unrealized):      
Included in earnings 25 15  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 25 15  
Notes issued by consolidated VIEs | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 15 14
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 15 14
Notes issued by consolidated VIEs | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings 25 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 25 0 0
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/liabilities still held:      
Included in earnings 0 0 0
Notes issued by consolidated VIEs | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Notes issued by consolidated VIEs | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Available-for-sale | Fixed Maturities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings (111) (67) (29)
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (139) (98) (60)
Available-for-sale | Fixed Maturities | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Available-for-sale | Fixed Maturities | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Available-for-sale | Fixed Maturities | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 368 86 (141)
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 331    
Available-for-sale | Fixed Maturities | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings 9 18 17
Available-for-sale | Fixed Maturities | U.S. government      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 105 81  
Purchases 45 24  
Sales 0 0  
Issuances 0 0  
Settlements 0 0  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 150 105 81
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0  
Available-for-sale | Fixed Maturities | U.S. states      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 4 5  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements 0 (1)  
Other 0 0  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Fair Value, end of period 4 4 5
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0  
Available-for-sale | Fixed Maturities | Foreign government bonds      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 22 125  
Purchases 0 0  
Sales 0 0  
Issuances 0 0  
Settlements 0 0  
Other 0 (1)  
Transfers into Level 3 1 10  
Transfers out of Level 3 (12) (112)  
Fair Value, end of period 11 22 125
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 (2)  
Available-for-sale | Fixed Maturities | Corporate securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 3,236 2,685  
Purchases 1,144 1,462  
Sales (127) (47)  
Issuances 0 0  
Settlements (1,021) (1,137)  
Other (16) 10  
Transfers into Level 3 2,178 353  
Transfers out of Level 3 (333) (87)  
Fair Value, end of period 5,335 3,236 2,685
Total gains (losses) (realized/unrealized):      
Included in earnings 274 (3)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 203 (96)  
Available-for-sale | Fixed Maturities | Structured securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 948 1,339  
Purchases 685 952  
Sales (18) (67)  
Issuances 0 0  
Settlements (547) (507)  
Other 156 (4)  
Transfers into Level 3 178 755  
Transfers out of Level 3 (851) (1,560)  
Fair Value, end of period 543 948 1,339
Total gains (losses) (realized/unrealized):      
Included in earnings (8) 40  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (11) 0  
Trading | Fixed Maturities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, beginning of period 287 206  
Purchases 33 105  
Sales (33) (31)  
Issuances 0 0  
Settlements 0 0  
Other 9 (7)  
Transfers into Level 3 19 41  
Transfers out of Level 3 (48) (1)  
Fair Value, end of period 243 287 206
Total gains (losses) (realized/unrealized):      
Included in earnings (24) (26)  
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (24) (27)  
Trading | Fixed Maturities | Realized investment gains (losses), net      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Trading | Fixed Maturities | Other Income      
Total gains (losses) (realized/unrealized):      
Included in earnings (25) (27) 5
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings (24) (27) 8
Trading | Fixed Maturities | Interest credited to policyholders' account balances      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0 0 0
Trading | Fixed Maturities | Included in other comprehensive income (loss)      
Total gains (losses) (realized/unrealized):      
Included in earnings 0 0 0
Unrealized gains (losses) for assets/liabilities still held:      
Included in earnings 0    
Trading | Fixed Maturities | Net investment income      
Total gains (losses) (realized/unrealized):      
Included in earnings $ 1 $ 1 $ 1