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Changes in and Reclassifications From Accumulated Other Comprehensive Income (Loss) - AOCI Rollforward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance $ 13,676 $ 17,805  
OCI, net of tax 992 (3,969) $ (977)
Ending balance 15,327 13,676 17,805
Net Unrealized Gain (Loss) on Fixed Maturities, AFS      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (2,594) 1,631 2,834
OCI, before Reclassifications, before Tax, Attributable to Parent 1,275 (5,630) (1,315)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (133) (282) 234
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 1,408 (5,348) (1,549)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (296) 1,123 325
OCI, net of tax 1,112 (4,225) (1,224)
Ending balance (1,482) (2,594) 1,631
Net Unrealized Gain (Loss) on Fixed Maturities, AFS | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     21
Net Unrealized Gain (Loss) on Fixed Maturities, AFS | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     2,855
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (7) (2) (2)
OCI, before Reclassifications, before Tax, Attributable to Parent (5) (6) 0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (4) 0 0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (1) (6) 0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 0 1 0
OCI, net of tax (1) (5) 0
Ending balance (8) (7) (2)
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     0
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     (2)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 40 6 12
OCI, before Reclassifications, before Tax, Attributable to Parent (25) 56 28
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (1) 13 36
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (24) 43 (8)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 5 (9) 2
OCI, net of tax (19) 34 (6)
Ending balance 21 40 6
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     12
Foreign Currency Translation Adjustments      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 31 41 43
OCI, before Reclassifications, before Tax, Attributable to Parent 8 (13) (3)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 0 0 0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 8 (13) (3)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (2) 3 1
OCI, net of tax 6 (10) (2)
Ending balance 37 31 41
Foreign Currency Translation Adjustments | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     0
Foreign Currency Translation Adjustments | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     43
AOCI, Liability for Future Policy Benefit, Parent      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 35 (59) 0
OCI, before Reclassifications, before Tax, Attributable to Parent (13) 119 33
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 0 0 0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (13) 119 33
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 3 (25) (6)
OCI, net of tax (10) 94 27
Ending balance 25 35 (59)
AOCI, Liability for Future Policy Benefit, Parent | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     (86)
AOCI, Liability for Future Policy Benefit, Parent | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     (86)
Pension and Other Postretirement Plan Adjustments      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (1,346) (1,489) (1,717)
OCI, before Reclassifications, before Tax, Attributable to Parent (148) 119 219
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (27) (62) (70)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (121) 181 289
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 25 (38) (61)
OCI, net of tax (96) 143 228
Ending balance (1,442) (1,346) (1,489)
Pension and Other Postretirement Plan Adjustments | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     0
Pension and Other Postretirement Plan Adjustments | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance     (1,717)
AOCI, net of tax      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (3,841) 128 1,170
OCI, before Reclassifications, before Tax, Attributable to Parent 1,092 (5,355) (1,038)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (165) (331) 200
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 1,257 (5,024) (1,238)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (265) 1,055 261
OCI, net of tax 992 (3,969) (977)
Ending balance (2,849) (3,841) 128
AOCI, net of tax | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 0 0 (65)
Ending balance   0 0
AOCI, net of tax | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance $ (3,841) 128 1,105
Ending balance   $ (3,841) $ 128