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Derivatives and Hedging Activities - Derivative Instrument Cash Flow Hedge Earning Recognized by Income Statement Location (Details) - Interest rate - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Derivatives, Fair Value [Line Items] |  |  |
Net Gains (Losses) Reclassified From AOCI Into Income | $ (360) | $ (735) | $ (953)
Cash Flow Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Gains (Losses) Recognized in OCI | 309 | (448) | (289)
Interest income – loans | Cash Flow Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Gains (Losses) Reclassified From AOCI Into Income | (358) | (733) | (956)
Interest expense — Long-term debt | Cash Flow Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Gains (Losses) Reclassified From AOCI Into Income | (2) | (2) | (2)
Investment banking and debt placement fees | Cash Flow Hedging |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Gains (Losses) Reclassified From AOCI Into Income | $ 0 | $ 0 | $ 5

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