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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)

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