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Derivative Financial Instruments - Fair Value Hedges Basis Adjustments (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Closed portfolio of securities hedged, amortized cost | $ 19,400 | $ 27,400
Items Currently Designated |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Closed portfolio of securities hedged, amortized cost | 14,800 | 16,400
Fair Value Hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Carrying Amount of the Hedged Liability | 28,633 | 28,194
Fair Value Hedges | Items Currently Designated |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cumulative basis adjustment increasing (decreasing) the carrying amount of the hedged liability | (354) | 70
Fair Value Hedges | Discontinued Hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cumulative basis adjustment increasing (decreasing) the carrying amount of the hedged liability | (305) | (375)
Fair Value Hedges | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecurities |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Carrying Amount of the Hedged Assets | 38,106 | 38,608
Fair Value Hedges | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecurities | Items Currently Designated |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cumulative basis adjustment increasing (decreasing) the carrying amount of the hedged assets | (148) | 104
Fair Value Hedges | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecurities | Discontinued Hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cumulative basis adjustment increasing (decreasing) the carrying amount of the hedged assets | (27) | 13
Fair Value Hedges | Location, Statement of Financial Position, Balance [Axis]: us-gaap:FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Carrying Amount of the Hedged Assets | 174 | 179
Fair Value Hedges | Location, Statement of Financial Position, Balance [Axis]: us-gaap:FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss | Items Currently Designated |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cumulative basis adjustment increasing (decreasing) the carrying amount of the hedged assets | 0 | 0
Fair Value Hedges | Location, Statement of Financial Position, Balance [Axis]: us-gaap:FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss | Discontinued Hedges |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cumulative basis adjustment increasing (decreasing) the carrying amount of the hedged assets | $ 2 | $ 3

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