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Derivatives (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value Assets | $ 8,737 | $ 11,411 |
Estimated Fair Value Liabilities | 6,298 | 6,975 |
Maximum Amount of Future Payments under Credit Default Swaps | 12,468 | 11,512 |
Estimated Fair Value of Credit Default Swaps | 228 | 105 |
Excess cash collateral received on derivatives | 163 | $ 252 |
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 | 4 years 6 months | 4 years 8 months 12 days |
Net investment gains (losses) | $ (2,824) | $ (1,260) | $ 1,543
Derivative Instrument Detail [Abstract] |  |  |
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges | $ 31 | $ 30 | (1)
Hedging exposure to variability in future cash flows for specific length of time | 5 years | 6 years |
Accumulated Other Comprehensive Income Loss | $ 166 | $ 2,000 |
Deferred net gains (losses) expected to be reclassified to earnings | 41 |  |
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges | 681 | 435 |
Excess securities collateral provided on derivatives | 98 | 125 |
Ba [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Maximum Amount of Future Payments under Credit Default Swaps | 42 | 87 |
Estimated Fair Value of Credit Default Swaps | $ 2 | $ 2 |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, Average Remaining Maturity | 2 years 7 months 6 days | 2 years 1 month 6 days |
Over the Counter [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset | $ 3,448 | $ 5,432 |
Excess securities collateral received on derivatives | (298) | (398) |
Excess securities collateral provided on derivatives | (1,500) | (1,200) |
Exchange Cleared [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 150 | 35 |
Excess securities collateral provided on derivatives | (945) | (1,000) |
Exchange Traded [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 0 | 0 |
Excess securities collateral provided on derivatives | (137) | (184) |
Cash Flow Hedging [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net investment gains (losses) | 102 | 19 | $ 82
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 | 3 years | 4 years |
Accrued Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value Assets | $ 181 | $ 166 |
Estimated Fair Value Liabilities | $ 9 | $ 0 |

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