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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Notional Amounts and Gross Fair Values of Derivative Assets and Derivative Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 15,349 | $ 15,924
Fair value, assets | 122 | 117
Fair value, liabilities | 208 | 313
Credit risk contracts – not designated |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 604 |
Subject to master netting arrangements: |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 7,714 | 8,301
Derivative assets, not offset against collateral | 64 | 96
Derivative liabilities, not offset against collateral | 51 | 22
Subject to master netting arrangements: | Interest rate contracts – designated |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 1,650 | 2,400
Derivative assets, not offset against collateral | 13 | 0
Derivative liabilities, not offset against collateral | 0 | 6
Subject to master netting arrangements: | Interest rate swaps – not designated |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 6,064 | 5,901
Derivative assets, not offset against collateral | 51 | 96
Derivative liabilities, not offset against collateral | 51 | 16
Not subject to master netting arrangements: |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 7,635 | 7,623
Not subject to master netting arrangement | 58 | 21
Not subject to master netting arrangement | 157 | 291
Not subject to master netting arrangements: | Interest rate swaps – not designated |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 6,064 | 5,901
Not subject to master netting arrangement | 51 | 16
Not subject to master netting arrangement | 155 | 287
Not subject to master netting arrangements: | Interest rate lock commitments – not designated |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 298 | 417
Not subject to master netting arrangement | 7 | 1
Not subject to master netting arrangement | 0 | 4
Not subject to master netting arrangements: | Forward delivery commitments – not designated |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 458 | 486
Not subject to master netting arrangement | 0 | 4
Not subject to master netting arrangement | 2 | 0
Not subject to master netting arrangements: | Credit risk contracts – not designated |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 815 | 819
Not subject to master netting arrangement | 0 | 0
Not subject to master netting arrangement | $ 0 | $ 0

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