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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jan. 01, 2020 | Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Allowance for credit loss, reserve build |  |  | $ 780 |  |  |
ACL Balance | $ 2,527 |  | 2,527 |  | $ 1,747 | $ 1,296
Loans and leases | 125,713 |  | 125,713 |  |  | 119,088
Mortgage loans collateralized by OREO | 135 |  | 135 |  |  | 152
Net change to ALLL from modification | 5 | $ 2 | 9 | $ 4 |  |
Charge-offs from modification of loans | 4 | 1 | $ 6 | 2 |  |
High loan to value criteria (exceeds) |  |  | 90.00% |  |  |
Commercial |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
ACL Balance | 1,304 |  | $ 1,304 |  | 539 | 718
Allowance for credit losses, individually evaluated for impairment | 5 |  | 5 |  |  |
Accrued interest receivable reversed against interest income | 2 |  | 3 |  |  |
Loans and leases | 64,930 |  | 64,930 |  |  | 57,538
TDR's that defaulted within 12 months of modification date | 26 | 1 | 39 | 1 |  |
Retail |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
ACL Balance | 1,223 |  | 1,223 |  | 1,208 | 578
Accrued interest receivable reversed against interest income | 4 |  | 9 |  |  |
Loans and leases | 60,783 |  | 60,783 |  |  | 61,550
TDR's that defaulted within 12 months of modification date | 14 | $ 10 | 25 | $ 19 |  |
Commercial | Commercial |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
ACL Balance | 847 |  | 847 |  | $ 376 | 575
Loans and leases | 48,017 |  | $ 48,017 |  |  | 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 | 405 |  | $ 405 |  |  | 227
Collateral Dependent | Commercial | Commercial |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Loans and leases | 213 |  | 213 |  |  | $ 85
Payment Deferral | Retail |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Loan restructuring, modification, amount | $ 3,500 |  | $ 3,500 |  |  |
Loan restructuring, modification, percentage of total portfolio | 6.00% |  | 6.00% |  |  |

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