v3.26.1
Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Unrealized gains (losses) for assets/liabilities still held:          
Market risk benefit assets $ 2,430 $ 2,188 $ 2,430 $ 2,188 $ 2,330
Market risk benefit liabilities 4,731 4,859 4,731 4,859 $ 4,623
Equity securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 568 733 626 518  
Purchases 65 62 88 216  
Sales (5) (35) (7) (58)  
Issuances 0 0 0 0  
Settlements 0 (1) (14) (1)  
Other 20 0 20 0  
Transfers into Level 3 2 1 2 120  
Transfers out of Level 3 0 (163) (33) (181)  
Fair Value, end of period 628 601 628 601  
Total gains (losses) (realized/unrealized):          
Included in earnings (22) 4 (54) (13)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (23) 4 (51) (19)  
Included in earnings 0 0 0 0  
Equity securities | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Equity securities | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Equity securities | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Equity securities | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings (22) 4 (54) (13)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (23) 4 (51) (19)  
Equity securities | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Commercial mortgage and other loans          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 270 263 263 233  
Purchases 5 0 44 0  
Sales 0 0 0 0  
Issuances 0 0 26 30  
Settlements (1) 0 (59) 0  
Other 0 0 0 0  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 274 263 274 263  
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Included in earnings 0 0 0 0  
Commercial mortgage and other loans | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Commercial mortgage and other loans | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Commercial mortgage and other loans | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Commercial mortgage and other loans | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Commercial mortgage and other loans | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Other invested assets          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 1,134 965 1,088 953  
Purchases 32 44 91 58  
Sales 0 (30) (12) (31)  
Issuances 0 0 0 0  
Settlements (9) 0 (9) 0  
Other 0 1 0 1  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 1 0 1  
Fair Value, end of period 1,151 978 1,151 978  
Total gains (losses) (realized/unrealized):          
Included in earnings (6) (3) (7) (4)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (6) (3) (7) (3)  
Included in earnings 0 0 0 0  
Other invested assets | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Other invested assets | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 (1) 0 (1)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Other invested assets | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Other invested assets | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings (6) (2) (7) (3)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (6) (2) (7) (3)  
Other invested assets | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 (1) 0 0  
Short-term investments          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 44 462 1 461  
Purchases 1 15 27 23  
Sales 0 (452) 0 (455)  
Issuances 0 0 0 0  
Settlements 0 (7) 28 (11)  
Other (21) (2) (21) (2)  
Transfers into Level 3 0 1 0 1  
Transfers out of Level 3 0 1 0 1  
Fair Value, end of period 21 18 21 18  
Total gains (losses) (realized/unrealized):          
Included in earnings (3) 0 (14) 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (2) 0 (14) 0  
Included in earnings 0 0 0 0  
Short-term investments | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Short-term investments | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Short-term investments | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Short-term investments | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Short-term investments | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings (3) 0 (14) 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (2) 0 (14) 0  
Cash equivalents          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 0 1 0 0  
Purchases 0 1 0 2  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements 0 (1) 0 (1)  
Other 0 0 0 0  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 0 1 0 1  
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Included in earnings 0 0 0 0  
Cash equivalents | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Cash equivalents | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Cash equivalents | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Cash equivalents | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Cash equivalents | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Reinsurance recoverables and deposit receivables          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 452 381 367 613  
Purchases 54 (2) 98 21  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements (16) (16) (37) (34)  
Other 0 (1) 2 (234)  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 478 367 478 367  
Total gains (losses) (realized/unrealized):          
Included in earnings (12) 5 48 1  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (12) (12) 11 (33)  
Included in earnings 0 0 0 0  
Reinsurance recoverables and deposit receivables | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Reinsurance recoverables and deposit receivables | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Reinsurance recoverables and deposit receivables | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Reinsurance recoverables and deposit receivables | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Reinsurance recoverables and deposit receivables | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings (12) 5 48 1  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (12) (12) 11 (33)  
Separate accounts assets          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 210 253 211 232  
Purchases 22 25 28 85  
Sales (7) (3) (8) (37)  
Issuances 0 0 0 0  
Settlements (5) (30) (13) (31)  
Other 0 0 0 0  
Transfers into Level 3 0 1 6 5  
Transfers out of Level 3 (52) (10) (52) (10)  
Fair Value, end of period 170 252 170 252  
Total gains (losses) (realized/unrealized):          
Included in earnings 2 16 (2) 8  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 2 15 (2) 5  
Included in earnings 0 0 0 0  
Separate accounts assets | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Separate accounts assets | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 2 16 (2) 8  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 2 15 (2) 5  
Separate accounts assets | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Separate accounts assets | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Separate accounts assets | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Policyholders’ account balances          
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period (17,590) (11,938) (18,799) (12,746)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances (74) (371) (455) (996)  
Settlements 0 0 0 0  
Other (3) (2) (2) (4)  
Transfers Into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period (22,809) (15,289) (22,809) (15,289)  
Total gains (losses) (realized/unrealized):          
Included in earnings (5,142) (2,978) (3,553) (1,543)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (480) (169) (3) 238  
Included in earnings 0 0 0 0  
Policyholders’ account balances | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Policyholders’ account balances | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Policyholders’ account balances | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Policyholders’ account balances | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Policyholders’ account balances | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings (5,142) (2,978) (3,553) (1,543)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (480) (169) (3) 238  
Other liabilities          
Fair Value, Assets And Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 0 (13) 0 (1)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements 0 0 0 0  
Other 0 0 0 0  
Transfers Into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 0 (15) 0 (15)  
Total gains (losses) (realized/unrealized):          
Included in earnings 0 (2) 0 (14)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 (2) 0 (14)  
Included in earnings 0 0 0 0  
Other liabilities | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Other liabilities | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Other liabilities | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Other liabilities | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Other liabilities | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 (2) 0 (14)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 (2) 0 (14)  
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 (1,330) (67) (767) (60)  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances (950) (124) (1,088) (131)  
Settlements 54 0 54 0  
Other 427 (4) 4 (4)  
Transfers Into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period (1,807) (195) (1,807) (195)  
Total gains (losses) (realized/unrealized):          
Included in earnings (8) 0 (10) 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (9) 0 (9) 0  
Included in earnings 0 0 0 0  
Notes issued by consolidated VIEs | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Notes issued by consolidated VIEs | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Notes issued by consolidated VIEs | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Notes issued by consolidated VIEs | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings (8) 0 (10) 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (9) 0 (9) 0  
Notes issued by consolidated VIEs | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Fixed maturities, available-for-sale | Fixed maturities          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 6 46 (105) 18  
Fixed maturities, available-for-sale | Fixed maturities | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 3 43 (105) 13  
Fixed maturities, available-for-sale | Fixed maturities | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Fixed maturities, available-for-sale | Fixed maturities | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 1 (1) 3 (4)  
Fixed maturities, available-for-sale | Fixed maturities | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Fixed maturities, available-for-sale | Fixed maturities | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings (22) (12) (99) (31)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (26) (11) (115) (33)  
Fixed maturities, available-for-sale | 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 5 5 6  
Purchases 0 (1) 0 (1)  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements 0 1 0 0  
Other 0 0 0 0  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 5 5 5 5  
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Fixed maturities, available-for-sale | Fixed maturities | Foreign government securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 5 5 5 7  
Purchases 0 0 0 0  
Sales 0 0 0 0  
Issuances 0 0 0 0  
Settlements 0 0 0 (2)  
Other 0 0 0 0  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Fair Value, end of period 5 5 5 5  
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Fixed maturities, available-for-sale | Fixed maturities | Corporate securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 7,465 6,279 6,933 5,831  
Purchases 435 839 1,121 1,707  
Sales (193) (121) (287) (471)  
Issuances 0 0 0 0  
Settlements (352) (408) (712) (602)  
Other (1,205) 11 (1,192) (30)  
Transfers into Level 3 26 18 495 252  
Transfers out of Level 3 0 0 (28) (1)  
Fair Value, end of period 6,160 6,660 6,160 6,660  
Total gains (losses) (realized/unrealized):          
Included in earnings (16) 42 (170) (26)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (22) 38 (187) (32)  
Fixed maturities, available-for-sale | Fixed maturities | Structured securities          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 5,896 3,217 5,055 2,333  
Purchases 1,505 1,502 2,803 2,328  
Sales (104) (446) (158) (769)  
Issuances 0 0 0 0  
Settlements (220) (168) (370) (233)  
Other 1,223 191 1,222 (171)  
Transfers into Level 3 41 199 41 1,064  
Transfers out of Level 3 (542) (158) (762) (233)  
Fair Value, end of period 7,800 4,328 7,800 4,328  
Total gains (losses) (realized/unrealized):          
Included in earnings 1 (9) (31) 9  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (1) (6) (33) 12  
Fixed maturities, trading | Fixed maturities          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value, beginning of period 2,915 2,138 2,313 1,986  
Purchases 527 289 1,251 712  
Sales (210) (10) (234) (271)  
Issuances 0 0 0 0  
Settlements (96) (86) (137) (338)  
Other (11) (183) (12) 183  
Transfers into Level 3 22 0 38 3  
Transfers out of Level 3 (520) (44) (548) (150)  
Fair Value, end of period 2,629 2,090 2,629 2,090  
Total gains (losses) (realized/unrealized):          
Included in earnings 2 (14) (42) (35)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (5) (31) (54) (39)  
Included in earnings 0 0 0 0  
Fixed maturities, trading | Fixed maturities | Location, Statement of Other Comprehensive Income, Balance [Axis]: us-gaap:OtherComprehensiveIncomeLossNetOfTax          
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Fixed maturities, trading | Fixed maturities | Income Statement Location [Axis]: us-gaap:InterestCreditedToPolicyholdersAccountBalances          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings 0 0 0 0  
Fixed maturities, trading | Fixed maturities | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 1 14 1 (1)  
Fixed maturities, trading | Fixed maturities | Income Statement Location [Axis]: us-gaap:OtherIncome          
Total gains (losses) (realized/unrealized):          
Included in earnings 1 (28) (43) (34)  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings (5) (31) (54) (39)  
Fixed maturities, trading | Fixed maturities | Income Statement Location [Axis]: us-gaap:RealizedInvestmentGainsLosses          
Total gains (losses) (realized/unrealized):          
Included in earnings 0 0 0 0  
Unrealized gains (losses) for assets/liabilities still held:          
Included in earnings $ 0 $ 0 $ 0 $ 0