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NONINTEREST INCOME - Components of Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 285 | $ 294
Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 179 | 190
Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 106 | 104
Service charges and fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 99 | 118
Service charges and fees | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 74 | 92
Service charges and fees | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 25 | 26
Card fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 54 | 55
Card fees | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 47 | 45
Card fees | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 7 | 10
Capital markets fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 72 | 65
Capital markets fees | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Capital markets fees | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 72 | 65
Trust and investment services fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 58 | 53
Trust and investment services fees | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 58 | 53
Trust and investment services fees | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Other banking fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 2 | 3
Other banking fees | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 | 0
Other banking fees | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 2 | $ 3

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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