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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 | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Beginning balance |  |  | $ 1,236 |  |
Provision charged to income |  |  | 241 | $ 238 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | $ 1,242 |  | 1,242 |  | $ 1,236
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 | 1,253 | $ 1,219 | 1,236 | 1,236 | 1,236
Charge-offs | (127) | (120) | (363) | (381) |
Recoveries | 41 | 55 | 131 | 154 |
Net charge-offs | (86) | (65) | (232) | (227) |
Provision charged to income | 75 | 70 | 238 | 215 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 1,242 | 1,224 | 1,242 | 1,224 | 1,236
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 | 88 | 93 | 88 | 72 | 72
Provision for unfunded lending commitments | 3 | 2 | 3 | 23 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 91 | 95 | 91 | 95 | 88
Allowance for loan and lease losses and reserve for off-balance sheet activities, total |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 1,333 | 1,319 | 1,333 | 1,319 |
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 | 715 | 614 | 685 | 663 | 663
Charge-offs | (18) | (12) | (35) | (60) |
Recoveries | 2 | 12 | 10 | 27 |
Net charge-offs | (16) | 0 | (25) | (33) |
Provision charged to income | 8 | 24 | 47 | 8 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 707 | 638 | 707 | 638 | 685
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 | 88 | 93 | 88 | 72 | 72
Provision for unfunded lending commitments | 3 | 2 | 3 | 23 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 91 | 95 | 91 | 95 | 88
Commercial | Allowance for loan and lease losses and reserve for off-balance sheet activities, total |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 798 | 733 | 798 | 733 |
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 | 538 | 605 | 551 | 573 | 573
Charge-offs | (109) | (108) | (328) | (321) |
Recoveries | 39 | 43 | 121 | 127 |
Net charge-offs | (70) | (65) | (207) | (194) |
Provision charged to income | 67 | 46 | 191 | 207 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 535 | 586 | 535 | 586 | 551
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 | 0 | 0
Provision for unfunded lending commitments | 0 | 0 | 0 | 0 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 0 | 0 | 0 | 0 | $ 0
Retail | Allowance for loan and lease losses and reserve for off-balance sheet activities, total |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | $ 535 | $ 586 | $ 535 | $ 586 |

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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