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Derivatives (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Derivatives, Fair Value [Line Items] |  |  |
Maximum Amount of Future Payments under Credit Default Swaps | $ 13,901 |  | $ 12,468
Estimated Fair Value Assets | 8,291 |  | 8,737
Estimated Fair Value Liabilities | 6,985 |  | 6,298
Excess securities collateral received on derivatives | 35 |  | $ 163
Collateral Amount Not Provided Due to Downgrade Threshold | 15 |  |
Derivative Instrument Detail [Abstract] |  |  |
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges | $ (10) | $ 1 |
Hedging exposure to variability in future cash flows for specific length of time | 5 years |  | 5 years
Accumulated Other Comprehensive Income Loss | $ 182 |  | $ 166
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges | 861 |  | 681
Excess securities collateral provided on derivatives | 99 |  | 98
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged | 0 |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | (56) |  |
Over the Counter [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Excess securities collateral received on derivatives | (324) |  | (298)
Excess securities collateral provided on derivatives | (1,400) |  | (1,500)
Cash collateral on derivative assets | (3,195) |  | (3,448)
Exchange-traded |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Excess securities collateral provided on derivatives | (154) |  | (137)
Cash collateral on derivative assets | 0 |  | 0
Accrued Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Estimated Fair Value Assets | 243 |  | 181
Estimated Fair Value Liabilities | $ 86 |  | $ 9

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