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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance $ 15,327 $ 13,676  
OCI, net of tax (37) 992 $ (3,969)
Ending balance 16,447 15,327 13,676
Net Unrealized Gain (Loss) on Fixed Maturities, AFS      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (1,482) (2,594) 1,631
OCI, before Reclassifications, before Tax, Attributable to Parent (241) 1,275 (5,630)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (169) (133) (282)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (72) 1,408 (5,348)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 15 (296) 1,123
OCI, net of tax (57) 1,112 (4,225)
Ending balance (1,539) (1,482) (2,594)
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (8) (7) (2)
OCI, before Reclassifications, before Tax, Attributable to Parent 2 (5) (6)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (1) (4) 0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 3 (1) (6)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (1) 0 1
OCI, net of tax 2 (1) (5)
Ending balance (6) (8) (7)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 21 40 6
OCI, before Reclassifications, before Tax, Attributable to Parent 27 (25) 56
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 3 (1) 13
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 24 (24) 43
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (5) 5 (9)
OCI, net of tax 19 (19) 34
Ending balance 40 21 40
Foreign Currency Translation Adjustments      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 37 31 41
OCI, before Reclassifications, before Tax, Attributable to Parent (10) 8 (13)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 0 0 0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (10) 8 (13)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 2 (2) 3
OCI, net of tax (8) 6 (10)
Ending balance 29 37 31
AOCI, Liability for Future Policy Benefit, Parent      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 25 35 (59)
OCI, before Reclassifications, before Tax, Attributable to Parent 10 (13) 119
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 0 0 0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 10 (13) 119
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (2) 3 (25)
OCI, net of tax 8 (10) 94
Ending balance 33 25 35
Pension and Other Postretirement Plan Adjustments      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (1,442) (1,346) (1,489)
OCI, before Reclassifications, before Tax, Attributable to Parent (34) (148) 119
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (32) (27) (62)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (2) (121) 181
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 1 25 (38)
OCI, net of tax (1) (96) 143
Ending balance (1,443) (1,442) (1,346)
AOCI, net of tax      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (2,849) (3,841) 128
OCI, before Reclassifications, before Tax, Attributable to Parent (246) 1,092 (5,355)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (199) (165) (331)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (47) 1,257 (5,024)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 10 (265) 1,055
OCI, net of tax (37) 992 (3,969)
Ending balance $ (2,886) $ (2,849) $ (3,841)