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Shares and Stockholders' Equity - Components and Changes in AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Balance as of beginning-of-year | $ 6,893 | $ 5,102 |
Balance as of end-of-year | 8,269 | 6,893 | $ 5,102
Unrealized Gain (Loss) on Fixed Maturity AFS Securities and Certain |  |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Balance as of beginning-of-year | (5,188) | (8,916) | 9,616
Income tax benefit (expense) | 317 | (849) | 5,039
Reclassification adjustment for gains (losses) included in net income (loss) | (205) | (860) | (15)
Income tax benefit (expense) | 43 | 181 | 3
Balance as of end-of-year | (6,239) | (5,188) | (8,916)
Unrealized holding gains (losses) arising during the year |  |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Changes arising during the year | (1,787) | 2,413 | (25,552)
Change in foreign currency exchange rate adjustment |  |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Changes arising during the year | (220) | 179 | (322)
Change in future contract benefits and policyholder account balances, net of reinsurance |  |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Changes arising during the year | 477 | 1,306 | 2,291
Unrealized Gain (Loss) on Derivative Instruments |  |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Balance as of beginning-of-year | 375 | 388 | (85)
Income tax benefit (expense) | (88) | (15) | (144)
Reclassification adjustment for gains (losses) included in net income (loss) | 89 | 91 | 92
Income tax benefit (expense) | (19) | (19) | (19)
Balance as of end-of-year | 638 | 375 | 388
Unrealized holding gains (losses) arising during the year |  |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Changes arising during the year | 201 | 243 | 378
Change in foreign currency exchange rate adjustment |  |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Changes arising during the year | 220 | (169) | 312
Market Risk Benefit Non-Performance Risk Gain (Loss) |  |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Balance as of beginning-of-year | 1,070 | 1,741 | 1,951
Adjustment arising during the year | (1,175) | (854) | (266)
Income tax benefit (expense) | 251 | 183 | 56
Balance as of end-of-year | 146 | 1,070 | 1,741
Policyholder Liability Discount Rate Remeasurement Gain (Loss) |  |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Balance as of beginning-of-year | 587 | 747 | (1,265)
Adjustment arising during the year | 198 | (206) | 2,559
Income tax benefit (expense) | (41) | 46 | (547)
Balance as of end-of-year | 744 | 587 | 747
Foreign Currency Translation Adjustment |  |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Balance as of beginning-of-year | (26) | (34) | (14)
Foreign currency translation adjustment arising during the year | (3) | 8 | (20)
Balance as of end-of-year | (29) | (26) | (34)
Funded Status of Employee Benefit Plans |  |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |  |
Balance as of beginning-of-year | (294) | (278) | (219)
Adjustment arising during the year | (5) | (13) | (74)
Income tax benefit (expense) | 3 | (3) | 15
Balance as of end-of-year | $ (296) | $ (294) | $ (278)

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