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NONINTEREST INCOME - Components of Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,080	$ 1,172
Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	690	818
Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	390	354
Service charges and fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	401	503
Service charges and fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	301	400
Service charges and fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	100	103
Card fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	216	254
Card fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	185	215
Card fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	31	39
Capital markets fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	249	202
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	249	202
Trust and investment services fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	203	202
Trust and investment services fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	203	202
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	11	11
Other banking fees | Consumer Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1	1
Other banking fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 10	$ 10

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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

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