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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term borrowed funds | $ 3 | $ 74
Hedging basis adjustments | 1,839 | 1,509
Available borrowing capacity | 63,300 |
FHLB advances and letters of credit | Secured Debt |  |
Debt Instrument [Line Items] |  |
Short-term borrowed funds | 15,700 | 2,300
Pledged as collateral for FHLB borrowing capacity |  |
Debt Instrument [Line Items] |  |
Available borrowing capacity | 11,500 | 15,900
Parent company |  |
Debt Instrument [Line Items] |  |
Principal balance | 3,400 | 3,200
Unamortized deferred issuance costs and or discounts | 75 | 80
CBNA and Other Subsidiaries |  |
Debt Instrument [Line Items] |  |
Principal balance | 12,600 | 3,800
Unamortized deferred issuance costs and or discounts | 10 | 7
Hedging basis adjustments | $ (27) | $ 42

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