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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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 |  |  | 163 | $ 166 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | $ 1,253 |  | 1,253 |  | $ 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 | 1,246 | $ 1,224 | 1,236 | 1,236 | 1,236
Charge-offs | (120) | (128) | (236) | (261) |
Recoveries | 44 | 53 | 90 | 99 |
Net charge-offs | (76) | (75) | (146) | (162) |
Provision charged to income | 83 | 70 | 163 | 145 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 1,253 | 1,219 | 1,253 | 1,219 | 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 | 86 | 93 | 88 | 72 | 72
Provision for unfunded lending commitments | 2 | 0 | 0 | 21 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 88 | 93 | 88 | 93 | 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 | 1,341 | 1,312 | 1,341 | 1,312 |
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 | 711 | 653 | 685 | 663 | 663
Charge-offs | (14) | (24) | (17) | (48) |
Recoveries | 2 | 10 | 8 | 15 |
Net charge-offs | (12) | (14) | (9) | (33) |
Provision charged to income | 16 | (25) | 39 | (16) |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 715 | 614 | 715 | 614 | 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 | 86 | 93 | 88 | 72 | 72
Provision for unfunded lending commitments | 2 | 0 | 0 | 21 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 88 | 93 | 88 | 93 | 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 | 803 | 707 | 803 | 707 |
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 | 535 | 571 | 551 | 573 | 573
Charge-offs | (106) | (104) | (219) | (213) |
Recoveries | 42 | 43 | 82 | 84 |
Net charge-offs | (64) | (61) | (137) | (129) |
Provision charged to income | 67 | 95 | 124 | 161 |
Allowance for loan and lease losses / Reserve for unfunded lending commitments, Ending balance | 538 | 605 | 538 | 605 | 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 | $ 538 | $ 605 | $ 538 | $ 605 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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