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Derivatives and Hedging Activities - Fair Values, Volume of Activity and Gain (Loss) Information Related to Derivative Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 154,866 | $ 155,415
Derivative assets, fair value | 472 | 612
Derivative assets, netting adjustments | (297) | (363)
Derivative assets, fair value, net | 153 | 249
Derivative liabilities, fair value | 927 | 1,439
Derivative liabilities, netting adjustments | (274) | (411)
Derivative liabilities, fair value, net | 652 | 1,027
Amount of offset in excess of collateral posted | 165 | 168
Amount of offset in excess of securities collateral posted | 218 | 215
Amount of offset in excess of cash collateral held | 3 | 13
Amount of offset in excess of securities collateral held | 78 | 32
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 90,638 | 90,714
Derivative assets, fair value | 485 | 616
Derivative liabilities, fair value | 923 | 1,436
Interest rate | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 64,228 | 64,701
Derivative assets, fair value | (13) | (4)
Derivative liabilities, fair value | 4 | 3
Interest rate | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 74,994 | 72,215
Derivative assets, fair value | 145 | 114
Derivative liabilities, fair value | 573 | 962
Foreign exchange | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 5,767 | 6,516
Derivative assets, fair value | 83 | 124
Derivative liabilities, fair value | 80 | 117
Commodity | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 5,553 | 8,778
Derivative assets, fair value | 249 | 363
Derivative liabilities, fair value | 237 | 343
Credit | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 107 | 60
Derivative assets, fair value | 0 | 0
Derivative liabilities, fair value | 8 | 0
Other | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 4,217 | 3,145
Derivative assets, fair value | 8 | 15
Derivative liabilities, fair value | 25 | 14
Net derivatives in the balance sheet |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 154,866 | 155,415
Derivative assets, fair value, net | 175 | 249
Derivative liabilities, fair value, net | 653 | 1,028
Other collateral |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, fair value, net | (22) | 0
Derivative liabilities, fair value, net | $ (1) | $ (1)

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