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BORROWED FUNDS - Long Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term borrowed funds | $ 15,887 | $ 6,932
Parent company |  |
Debt Instrument [Line Items] |  |
Long-term borrowed funds | $ 3,336 |
Parent company | Subordinated Debt | 4.150% fixed rate subordinated debt, due 2022 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.15% |
Long-term borrowed funds | $ 0 | 168
Parent company | Subordinated Debt | 3.750% fixed rate subordinated debt due 2024 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.75% |
Long-term borrowed funds | $ 90 | 90
Parent company | Subordinated Debt | 4.023% fixed rate subordinated debt, due 2024 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.023% |
Long-term borrowed funds | $ 17 | 17
Parent company | Subordinated Debt | 4.350% fixed rate subordinated debt, due 2025 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.35% |
Long-term borrowed funds | $ 133 | 133
Parent company | Subordinated Debt | 4.300% fixed rate subordinated debt, due 2025 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.30% |
Long-term borrowed funds | $ 336 | 336
Parent company | Subordinated Debt | 3.750% Fixed Rate Subordinated Debt, Due February 2031 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.75% |
Long-term borrowed funds | $ 69 | 69
Parent company | Subordinated Debt | 4.300% Fixed Rate Subordinated Debt, Due February 2031 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.30% |
Long-term borrowed funds | $ 135 | 135
Parent company | Subordinated Debt | 4.350% Fixed Rate Subordinated Debt, Due February 2031 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.35% |
Long-term borrowed funds | $ 61 | $ 60
Parent company | Subordinated Debt | 2.638% fixed-rate subordinated debt, due September 2032 |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 2.638%
Long-term borrowed funds | $ 556 | $ 550
Parent company | Subordinated Debt | Subordinated Debt, 5.641% Fixed Rate, Due May 2037 |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.641% |
Long-term borrowed funds | $ 397 | 0
Parent company | Senior Unsecured Notes | 2.850% fixed-rate senior unsecured notes, due July 2026 |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.85% |
Long-term borrowed funds | $ 498 | 498
Parent company | Senior Unsecured Notes | 2.500% fixed-rate senior unsecured notes, due February 2030 |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.50% |
Long-term borrowed funds | $ 298 | 298
Parent company | Senior Unsecured Notes | 3.250% fixed-rate senior unsecured notes, due April 2030 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.25% |
Long-term borrowed funds | $ 746 | 745
CBNA and Other Subsidiaries |  |
Debt Instrument [Line Items] |  |
Long-term borrowed funds | $ 12,551 |
CBNA and Other Subsidiaries | Senior Unsecured Notes | 3.250% senior unsecured notes, due February 2022 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.25% |
Long-term borrowed funds | $ 0 | 700
CBNA and Other Subsidiaries | Senior Unsecured Notes | 0.845% Floating-Rate Senior Unsecured Notes, Due February 2022 |  |
Debt Instrument [Line Items] |  |
Interest rate | 0.845% |
Long-term borrowed funds | $ 0 | 300
CBNA and Other Subsidiaries | Senior Unsecured Notes | 1.318 Floating-Rate Senior Unsecured Notes, Due May 2022 |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.318% |
Long-term borrowed funds | $ 0 | 250
CBNA and Other Subsidiaries | Senior Unsecured Notes | 2.650% senior unsecured notes, due May 2022 |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.65% |
Long-term borrowed funds | $ 0 | 503
CBNA and Other Subsidiaries | Senior Unsecured Notes | 3.700% senior unsecured notes, due March 2023 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.70% |
Long-term borrowed funds | $ 497 | 512
CBNA and Other Subsidiaries | Senior Unsecured Notes | 5.676% Floating-Rate Senior Unsecured Notes, Due March 2023 |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.676% |
Long-term borrowed funds | $ 250 | 250
CBNA and Other Subsidiaries | Senior Unsecured Notes | 2.250% senior unsecured notes, due April 2025 |  |
Debt Instrument [Line Items] |  |
Interest rate | 2.25% |
Long-term borrowed funds | $ 748 | 746
CBNA and Other Subsidiaries | Senior Unsecured Notes | Senior Unsecured Notes, 4.119% Fixed/Floating-Rate, Due May 2025 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.119% |
Long-term borrowed funds | $ 648 | 0
CBNA and Other Subsidiaries | Senior Unsecured Notes | Senior Unsecured Notes, 6.064% Fixed/Floating-Rate, Due October 2025 |  |
Debt Instrument [Line Items] |  |
Interest rate | 6.064% |
Long-term borrowed funds | $ 598 | 0
CBNA and Other Subsidiaries | Senior Unsecured Notes | 3.750% senior unsecured notes, due February 2026 |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.75% |
Long-term borrowed funds | $ 475 | 524
CBNA and Other Subsidiaries | Senior Unsecured Notes | Senior Unsecured Notes, 4.575% Fixed/Floating-Rate, Due August 2028 |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.575% |
Long-term borrowed funds | $ 797 | 0
CBNA and Other Subsidiaries | Federal Home Loan advances |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 4.283% |
Long-term borrowed funds | $ 8,519 | 19
CBNA and Other Subsidiaries | Other |  |
Debt Instrument [Line Items] |  |
Long-term borrowed funds | $ 19 | $ 29

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