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NONINTEREST INCOME - Components of Revenue from Contracts with Customers (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 1,119 | [1]
Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 786 |
Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 333 |
Service charges and fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 513 | [1]
Service charges and fees | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 408 |
Service charges and fees | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 105 |
Card fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 244 | [1]
Card fees | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 207 |
Card fees | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 37 |
Capital markets fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 181 | [1]
Capital markets fees | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 |
Capital markets fees | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 181 |
Trust and investment services fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 171 | [1]
Trust and investment services fees | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 171 |
Trust and investment services fees | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 |
Other banking fees |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 10 | [1]
Other banking fees | Consumer Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | 0 |
Other banking fees | Commercial Banking |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contracts with customers | $ 10 |
[1] | There is no revenue from contracts with customers included in Other non-segment operations.

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- Definition Amount, including 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
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