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INCOME TAXES - Effective Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amount
U.S. Federal income tax expense	$ 273	$ 473	$ 459
Increase (decrease) resulting from:
Federal rate change	0	0	(34)
State and local income taxes (net of federal benefit)	54	73	89
Bank-owned life insurance	(12)	(12)	(12)
Tax-exempt interest	(10)	(15)	(15)
Tax advantaged investments (including related credits)	(68)	(50)	(44)
Other tax credits	(6)	(10)	(8)
Adjustments for uncertain tax positions	(1)	0	1
Non-deductible FDIC premiums	14	13	21
Legacy tax matters	(4)	(19)	0
Other	1	7	5
Income tax expense	$ 241	$ 460	$ 462
Rate
U.S. Federal income tax rate	21.00%	21.00%	21.00%
Increase (decrease) resulting from:
Federal rate change	0.00%	0.00%	(1.60%)
State and local income taxes (net of federal benefit)	4.20%	3.20%	4.10%
Bank-owned life insurance	(0.90%)	(0.50%)	(0.50%)
Tax-exempt interest	(0.70%)	(0.70%)	(0.70%)
Tax advantaged investments (including related credits)	(5.30%)	(2.30%)	(2.00%)
Other tax credits	(0.50%)	(0.40%)	(0.40%)
Adjustments for uncertain tax positions	(0.10%)	0.00%	0.10%
Non-deductible FDIC premiums	1.10%	0.60%	1.00%
Legacy tax matters	(0.30%)	(0.80%)	0.00%
Other	0.00%	0.30%	0.20%
Total income tax expense and tax rate	18.50%	20.40%	21.20%

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