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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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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
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