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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Summary of Changes in Allowance for Credit Losses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | $ 2,443 |  |
Charge-offs | (325) |  |
Provision for credit losses | (411) | $ 1,616 | $ 393
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 1,758 | 2,443 |
Allowance for loan and lease losses |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | 2,443 | 1,252 | 1,242
Charge-offs | (539) | (843) | (615)
Recoveries | 214 | 150 | 185
Net charge-offs | (325) | (693) | (430)
Provision for credit losses | (360) | 1,431 | 440
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 1,758 | 2,443 | 1,252
Reserve for unfunded lending commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | 227 | 44 | 91
Provision for unfunded lending commitments | (51) | 185 | (47)
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 176 | 227 | 44
Allowance, Credit Loss |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | 2,670 | 1,296 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 1,934 | 2,670 | 1,296
Commercial | Allowance for loan and lease losses |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | 1,233 | 674 | 690
Charge-offs | (218) | (437) | (140)
Recoveries | 54 | 12 | 24
Net charge-offs | (164) | (425) | (116)
Provision for credit losses | (248) | 1,160 | 100
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 821 | 1,233 | 674
Commercial | Reserve for unfunded lending commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | 186 | 44 | 91
Provision for unfunded lending commitments | (33) | 145 | (47)
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 153 | 186 | 44
Commercial | Allowance, Credit Loss |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | 1,419 | 718 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 974 | 1,419 | 718
Retail | Allowance for loan and lease losses |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | 1,210 | 578 | 552
Charge-offs | (321) | (406) | (475)
Recoveries | 160 | 138 | 161
Net charge-offs | (161) | (268) | (314)
Provision for credit losses | (112) | 271 | 340
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 937 | 1,210 | 578
Retail | Reserve for unfunded lending commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | 41 | 0 | 0
Provision for unfunded lending commitments | (18) | 40 | 0
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 23 | 41 | 0
Retail | Allowance, Credit Loss |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | 1,251 | 578 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | $ 960 | 1,251 | 578
Cumulative Effect, Period of Adoption, Adjustment | Allowance for loan and lease losses |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | 453 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | 453
Cumulative Effect, Period of Adoption, Adjustment | Reserve for unfunded lending commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | (2) |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | (2)
Cumulative Effect, Period of Adoption, Adjustment | Commercial | Allowance for loan and lease losses |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | (176) |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | (176)
Cumulative Effect, Period of Adoption, Adjustment | Commercial | Reserve for unfunded lending commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | (3) |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | (3)
Cumulative Effect, Period of Adoption, Adjustment | Retail | Allowance for loan and lease losses |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | 629 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | 629
Cumulative Effect, Period of Adoption, Adjustment | Retail | Reserve for unfunded lending commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | 1 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | 1
Cumulative Effect, Period Of Adoption, Adjusted Balance | Allowance for loan and lease losses |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | 1,705 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | 1,705
Cumulative Effect, Period Of Adoption, Adjusted Balance | Reserve for unfunded lending commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | 42 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | 42
Cumulative Effect, Period Of Adoption, Adjusted Balance | Commercial | Allowance for loan and lease losses |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | 498 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | 498
Cumulative Effect, Period Of Adoption, Adjusted Balance | Commercial | Reserve for unfunded lending commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | 41 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | 41
Cumulative Effect, Period Of Adoption, Adjusted Balance | Retail | Allowance for loan and lease losses |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | 1,207 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | 1,207
Cumulative Effect, Period Of Adoption, Adjusted Balance | Retail | Reserve for unfunded lending commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  | $ 1 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance |  |  | $ 1

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