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DERIVATIVE FINANCIAL INSTRUMENTS - Hedging Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional Value | $ 42,311 | $ 45,809
Asset derivatives included in accrued income and other assets |  |
Total contracts | 502 | 610
Liability derivatives included in accrued expenses and other liabilities |  |
Total contracts | 508 | 668
Accrued income and other assets |  |
Asset derivatives included in accrued income and other assets |  |
Total contracts | 502 | 610
Accrued expenses and other liabilities |  |
Liability derivatives included in accrued expenses and other liabilities |  |
Total contracts | 508 | 668
Interest rate contracts | Accrued income and other assets |  |
Asset derivatives included in accrued income and other assets |  |
Interest rate contracts designated as hedging instruments | 122 | 24
Interest rate contracts | Accrued expenses and other liabilities |  |
Liability derivatives included in accrued expenses and other liabilities |  |
Interest rate contracts designated as hedging instruments | 38 | 0
Foreign exchange contracts | Accrued income and other assets |  |
Asset derivatives included in accrued income and other assets |  |
Interest rate contracts designated as hedging instruments | 0 | 0
Foreign exchange contracts | Accrued expenses and other liabilities |  |
Liability derivatives included in accrued expenses and other liabilities |  |
Interest rate contracts designated as hedging instruments | 2 | 5
Credit contracts | Accrued income and other assets |  |
Asset derivatives included in accrued income and other assets |  |
Derivative instruments not designated as hedging instruments, asset | 3 | 2
Credit contracts | Accrued expenses and other liabilities |  |
Liability derivatives included in accrued expenses and other liabilities |  |
Derivative credit and equity contracts not designated as hedging instruments, liability | 0 | 0
Derivatives designated as Hedging Instruments | Interest rate contracts | Accrued income and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Value | 42,136 | 45,634
Derivatives designated as Hedging Instruments | Foreign exchange contracts | Accrued income and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Value | 266 | 250
Derivatives not designated as Hedging Instruments | Accrued income and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Value | 97,988 | 95,461
Derivatives not designated as Hedging Instruments | Interest rate contracts | Accrued income and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Value | 47,557 | 42,359
Asset derivatives included in accrued income and other assets |  |
Interest rate contracts not designated as hedging instruments | 261 | 456
Derivatives not designated as Hedging Instruments | Interest rate contracts | Accrued expenses and other liabilities |  |
Liability derivatives included in accrued expenses and other liabilities |  |
Interest rate contracts not designated as hedging instruments | 389 | 580
Derivatives not designated as Hedging Instruments | Foreign exchange contracts | Accrued income and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Value | 6,287 | 5,465
Asset derivatives included in accrued income and other assets |  |
Foreign exchange contracts not designated as hedging instruments | 61 | 79
Derivatives not designated as Hedging Instruments | Foreign exchange contracts | Accrued expenses and other liabilities |  |
Liability derivatives included in accrued expenses and other liabilities |  |
Foreign exchange contracts not designated as hedging instruments | 52 | 54
Derivatives not designated as Hedging Instruments | Equity contracts | Accrued income and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Value | 897 | 823
Asset derivatives included in accrued income and other assets |  |
Commodities contracts not designated as hedging instruments | 32 | 20
Derivatives not designated as Hedging Instruments | Equity contracts | Accrued expenses and other liabilities |  |
Liability derivatives included in accrued expenses and other liabilities |  |
Commodities contracts not designated as hedging instruments | 6 | 2
Derivatives not designated as Hedging Instruments | Commodities contracts | Accrued income and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Value | 685 | 683
Asset derivatives included in accrued income and other assets |  |
Derivative instruments not designated as hedging instruments, asset | 23 | 29
Derivatives not designated as Hedging Instruments | Commodities contracts | Accrued expenses and other liabilities |  |
Liability derivatives included in accrued expenses and other liabilities |  |
Derivative credit and equity contracts not designated as hedging instruments, liability | 21 | 27
Derivatives not designated as Hedging Instruments | Credit contracts | Accrued income and other assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Value | $ 160 | $ 247

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