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Derivative Instruments - Change in Our Unrealized Gain on Derivative Instruments in AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Change in our unrealized gain on derivative instruments in accumulated OCI |  |
Balance as of beginning-of-year | $ 6,893 |
Balance as of end-of-period | 7,546 | $ 6,732
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
Income tax benefit (expense) | (35) | (15)
Reclassification adjustment for gains (losses) included in net income (loss) | 24 | 22
Income tax benefit (expense) | (5) | (5)
Balance as of end-of-period | 486 | 423
Unrealized Gain (Loss) on Derivative Instruments | Interest rate contracts | Interest and Debt Expense |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |
Reclassification adjustment for gains (losses) included in net income (loss) | 9 | 6
Unrealized Gain (Loss) on Derivative Instruments | Foreign currency contracts | Net Investment Income |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |
Reclassification adjustment for gains (losses) included in net income (loss) | 15 | 14
Unrealized Gain (Loss) on Derivative Instruments | Foreign currency contracts | Realized Gain (Loss) |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |
Reclassification adjustment for gains (losses) included in net income (loss) | 0 | 2
Unrealized holding gains (losses) arising during the year |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |
Changes arising during the year | 64 | 134
Unrealized holding gains (losses) arising during the year | Interest rate contracts |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |
Changes arising during the year | 89 | 58
Unrealized holding gains (losses) arising during the year | Foreign currency contracts |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |
Changes arising during the year | (25) | 76
Change in foreign currency exchange rate adjustment |  |
Change in our unrealized gain on derivative instruments in accumulated OCI |  |
Changes arising during the year | $ 101 | $ (67)

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