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NONINTEREST INCOME - Components of Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 285	$ 285	$ 863	$ 833
Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	210	201	611	585
Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	75	84	252	248
Service charges and fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	127	131	375	382
Service charges and fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	102	105	298	303
Service charges and fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	25	26	77	79
Card fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	67	61	190	182
Card fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57	51	162	154
Card fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10	10	28	28
Capital markets fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	38	46	140	134
Capital markets fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Capital markets fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	38	46	140	134
Trust and investment services fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	50	45	150	128
Trust and investment services fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	50	45	150	128
Trust and investment services fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Other banking fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3	2	8	7
Other banking fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	0	1	0
Other banking fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2	$ 2	$ 7	$ 7

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+ References

No definition available.

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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 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: 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=118956577&loc=SL49130545-203045

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