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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Allowance for credit loss, reserve build | $ 451 | $ 923 |  |
ACL Balance | 1,747 | 2,670 | $ 1,296 |
Loans and leases |  | 123,090 | 119,088 |
Mortgage loans collateralized by residential real estate property |  | 119 | 152 |
Net change to ALLL from modification |  | 12 | 9 | $ 3
Charge-offs from modification of loans |  | $ 51 | 7 | 5
High loan to value criteria (exceeds) |  | 90.00% |  |
Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Allowance for credit losses, individually evaluated for impairment |  | $ 5 |  |
Accrued interest receivable reversed against interest income |  | 8 |  |
ACL Balance | 539 | 1,419 | 718 |
Loans and leases |  | 60,793 | 57,538 |
TDR's that defaulted within 12 months of modification date |  | 54 | 1 | 63
Retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Accrued interest receivable reversed against interest income |  | 19 |  |
ACL Balance | 1,208 | 1,251 | 578 |
Loans and leases |  | 62,297 | 61,550 |
TDR's that defaulted within 12 months of modification date |  | 46 | 37 | $ 40
Commercial and industrial | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
ACL Balance | $ 376 | 895 | 575 |
Loans and leases |  | $ 44,173 | 41,479 |
Collateral Dependent | Home Equity Loan And Residential Mortgages | Retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Collateral value, valuation frequency period |  | 90 days |  |
Loans and leases |  | $ 552 | 227 |
Collateral Dependent | Commercial and industrial | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loans and leases |  | 206 | $ 85 |
Payment Deferral | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan restructuring, modification, amount |  | $ 343 |  |
Loan restructuring, modification, percentage of total portfolio |  | 0.60% |  |
Payment Deferral | Retail |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan restructuring, modification, amount |  | $ 1,400 |  |
Loan restructuring, modification, percentage of total portfolio |  | 2.30% |  |
Payment Deferral | Business Banking Portfolio |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loan restructuring, modification, amount |  | $ 53 |  |
Loan restructuring, modification, percentage of total portfolio |  | 1.00% |  |

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