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Derivatives (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value Assets | $ 8,212 | $ 8,737 |
Estimated Fair Value Liabilities | 7,259 | 6,298 |
Maximum Amount of Future Payments under Credit Default Swaps | 11,764 | 12,468 |
Estimated Fair Value of Credit Default Swaps | 196 | 228 |
Excess cash collateral received on derivatives | 26 | $ 163 |
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged | $ 0 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Average Remaining Maturity | 3 years 4 months 24 days | 4 years 6 months |
Net investment gains (losses) | $ (1,184) | $ (2,824) | $ (1,260)
Derivative Instrument Detail [Abstract] |  |  |
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges | $ 4 | $ 31 | 30
Hedging exposure to variability in future cash flows for specific length of time | 4 years | 5 years |
Accumulated Other Comprehensive Income Loss | $ 357 | $ 166 |
Deferred net gains (losses) expected to be reclassified to earnings | (18) |  |
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges | 1,100 | 681 |
Excess securities collateral provided on derivatives | 86 | 98 |
Ba [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Maximum Amount of Future Payments under Credit Default Swaps | 42 | 42 |
Estimated Fair Value of Credit Default Swaps | $ 2 | $ 2 |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Average Remaining Maturity | 1 year 7 months 6 days | 2 years 7 months 6 days |
Over the Counter [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset | $ 2,597 | $ 3,448 |
Excess securities collateral received on derivatives | (410) | (298) |
Excess securities collateral provided on derivatives | (1,200) | (1,500) |
Exchange Cleared [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 126 | 150 |
Excess securities collateral provided on derivatives | (835) | (945) |
Exchange Traded [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 0 | 0 |
Excess securities collateral provided on derivatives | (148) | (137) |
Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net investment gains (losses) | (9) | 102 | $ 19
Accrued Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value Assets | 158 | 181 |
Estimated Fair Value Liabilities | 13 | 9 |
Credit Index Product [Member] | Ba [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Maximum Amount of Future Payments under Credit Default Swaps | 25 | 25 |
Estimated Fair Value of Credit Default Swaps | $ 2 | $ 2 |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Average Remaining Maturity | 2 years | 3 years |

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