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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Summary of Changes in Allowance for Credit Losses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | $ 1,252 |  |
Provision charged to income | 1,616 | $ 393 | $ 326
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 2,443 | 1,252 |
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 | 1,252 | 1,242 | 1,236
Charge-offs | (843) | (615) | (494)
Recoveries | 150 | 185 | 177
Net charge-offs | (693) | (430) | (317)
Provision charged to income | 1,431 | 440 | 323
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 2,443 | 1,252 | 1,242
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 | 44 | 91 | 88
Provision for unfunded lending commitments | 185 | (47) | 3
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 227 | 44 | 91
Allowance, Credit Loss |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance | 1,296 | 1,333 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 2,670 | 1,296 | 1,333
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 | 674 | 690 | 685
Charge-offs | (437) | (140) | (52)
Recoveries | 12 | 24 | 19
Net charge-offs | (425) | (116) | (33)
Provision charged to income | 1,160 | 100 | 38
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 1,233 | 674 | 690
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 | 44 | 91 | 88
Provision for unfunded lending commitments | 145 | (47) | 3
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 186 | 44 | 91
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 | 718 | 781 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 1,419 | 718 | 781
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 | 578 | 552 | 551
Charge-offs | (406) | (475) | (442)
Recoveries | 138 | 161 | 158
Net charge-offs | (268) | (314) | (284)
Provision charged to income | 271 | 340 | 285
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 1,210 | 578 | 552
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 | 0 | 0 | 0
Provision for unfunded lending commitments | 40 | 0 | 0
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 41 | 0 | 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 | 578 | 552 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 1,251 | 578 | $ 552
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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