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Derivatives (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Derivatives, Fair Value [Line Items] |  |  |  |  |
Maximum Amount of Future Payments under Credit Default Swaps | $ 11,786 |  | $ 11,786 |  | $ 8,626
Estimated Fair Value Assets | 11,583 |  | 11,583 |  | 10,466
Estimated Fair Value Liabilities | 6,855 |  | 6,855 |  | 3,852
Excess securities collateral received on derivatives | 492 |  | 492 |  | $ 172
Collateral Amount Not Provided Due to Downgrade Threshold | 15 |  | 15 |  |
Derivative Instrument Detail [Abstract] |  |  |  |  |
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges | 4 | $ 1 | $ 2 | $ (1) |
Hedging exposure to variability in future cash flows for specific length of time |  |  | 7 years |  | 7 years
Accumulated Other Comprehensive Income Loss | 2,300 |  | $ 2,300 |  | $ 2,100
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges | 570 |  | 570 |  | 303
Excess securities collateral provided on derivatives | 110 |  | 110 |  | 126
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged | 0 |  | 0 |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | 320 |  |
Nonperformance Risk [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net derivatives gains (losses) | 18 | $ (8) | 4 | $ (51) |
Over the Counter [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Excess securities collateral received on derivatives | (125) |  | (125) |  | (160)
Excess securities collateral provided on derivatives | (1,100) |  | (1,100) |  | (243)
Cash collateral on derivative assets | (6,454) |  | (6,454) |  | (6,948)
Exchange-traded |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Excess securities collateral received on derivatives | (1,100) |  | (1,100) |  | (1,200)
Excess securities collateral provided on derivatives | (164) |  | (164) |  | (185)
Cash collateral on derivative assets | 0 |  | 0 |  | 0
Accrued Liabilities [Member] |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Estimated Fair Value Assets | 140 |  | 140 |  | 130
Estimated Fair Value Liabilities | $ (15) |  | $ (15) |  | $ (23)

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- Definition Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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