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Derivative Financial Instruments - Notional Amounts and Fair Values for All Derivative Instruments Included in the Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jul. 21, 2025 | Dec. 31, 2024
--- | --- | --- | ---
Derivatives, Fair Value |  |  |
Derivative Assets | $ 1,837 |  | $ 2,472
Derivative Liabilities | 2,055 |  | 2,798
Amount of variation margin payment applied to derivative asset contracts | 302 |  | 403
Amount of variation margin payment applied to derivative liability contracts | 381 |  | 1,200
Forward contracts related to residential mortgage loans measured at fair value |  |  |
Derivatives, Fair Value |  |  |
Notional Amount |  | $ 150 |
Designated as Hedging Instrument |  |  |
Derivatives, Fair Value |  |  |
Derivative Assets | 1 |  | 7
Derivative Liabilities | 13 |  | 16
Designated as Hedging Instrument | Fair Value Hedging |  |  |
Derivatives, Fair Value |  |  |
Derivative Assets | 1 |  | 1
Derivative Liabilities | 12 |  | 12
Designated as Hedging Instrument | Fair Value Hedging | Interest rate swap | Long-term debt |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 4,205 |  | 4,955
Derivative Assets | 1 |  | 1
Derivative Liabilities | 12 |  | 12
Designated as Hedging Instrument | Cash Flow Hedging |  |  |
Derivatives, Fair Value |  |  |
Derivative Assets | 0 |  | 6
Derivative Liabilities | 1 |  | 4
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap | Commercial and industrial |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 6,850 |  | 11,000
Derivative Assets | 0 |  | 2
Derivative Liabilities | 1 |  | 4
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap | Commercial mortgage and commercial construction |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 4,000 |  |
Derivative Assets | 0 |  |
Derivative Liabilities | 0 |  |
Designated as Hedging Instrument | Cash Flow Hedging | Forward starting interest rate swap | Commercial and industrial |  |  |
Derivatives, Fair Value |  |  |
Notional Amount |  |  | 1,000
Derivative Assets |  |  | 1
Derivative Liabilities |  |  | 0
Designated as Hedging Instrument | Cash Flow Hedging | Forward starting interest rate swap | Commercial mortgage and commercial construction |  |  |
Derivatives, Fair Value |  |  |
Notional Amount |  |  | 4,000
Derivative Assets |  |  | 3
Derivative Liabilities |  |  | 0
Not Designated as Hedging Instrument |  |  |
Derivatives, Fair Value |  |  |
Derivative Assets | 1,836 |  | 2,465
Derivative Liabilities | 2,042 |  | 2,782
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes |  |  |
Derivatives, Fair Value |  |  |
Derivative Assets | 13 |  | 15
Derivative Liabilities | 157 |  | 174
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Interest rate contracts related to MSR portfolio |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 4,750 |  | 3,135
Derivative Assets | 10 |  | 4
Derivative Liabilities | 2 |  | 4
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Forward contracts related to residential mortgage loans measured at fair value | Loans Measured At Fair Value |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 1,412 |  | 881
Derivative Assets | 2 |  | 8
Derivative Liabilities | 5 |  | 0
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Swap |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 2,627 |  | 2,465
Derivative Assets | 0 |  | 0
Derivative Liabilities | 150 |  | 170
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Foreign exchange contracts |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 124 |  | 104
Derivative Assets | 1 |  | 2
Derivative Liabilities | 0 |  | 0
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Interest-only strips |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 24 |  | 30
Derivative Assets | 0 |  | 0
Derivative Liabilities | 0 |  | 0
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Interest rate contracts for collateral management |  |  |
Derivatives, Fair Value |  |  |
Notional Amount |  |  | 1,000
Derivative Assets |  |  | 1
Derivative Liabilities |  |  | 0
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Interest rate contracts for LIBOR transition |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 597 |  | 597
Derivative Assets | 0 |  | 0
Derivative Liabilities | 0 |  | 0
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Other |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 48 |  | 43
Derivative Assets | 0 |  | 0
Derivative Liabilities | 0 |  | 0
Not Designated as Hedging Instrument | Customer Accommodation |  |  |
Derivatives, Fair Value |  |  |
Derivative Assets | 1,823 |  | 2,450
Derivative Liabilities | 1,885 |  | 2,608
Not Designated as Hedging Instrument | Customer Accommodation | Foreign exchange contracts |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 29,158 |  | 38,640
Derivative Assets | 667 |  | 1,165
Derivative Liabilities | 628 |  | 1,120
Not Designated as Hedging Instrument | Customer Accommodation | Interest rate contracts |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 81,917 |  | 87,928
Derivative Assets | 481 |  | 708
Derivative Liabilities | 585 |  | 924
Amount of variation margin payment applied to derivative asset contracts | 132 |  | 257
Amount of variation margin payment applied to derivative liability contracts | 33 |  | 45
Not Designated as Hedging Instrument | Customer Accommodation | Interest rate lock commitments |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 562 |  | 264
Derivative Assets | 8 |  | 2
Derivative Liabilities | 0 |  | 0
Not Designated as Hedging Instrument | Customer Accommodation | Commodity contracts |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 17,379 |  | 16,889
Derivative Assets | 667 |  | 575
Derivative Liabilities | 672 |  | 564
Not Designated as Hedging Instrument | Customer Accommodation | TBA securities |  |  |
Derivatives, Fair Value |  |  |
Notional Amount | 28 |  | 44
Derivative Assets | 0 |  | 0
Derivative Liabilities | $ 0 |  | $ 0

X
- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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Name: | us-gaap_DerivativeAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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