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Securities - Details of Securities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
SECURITIES AVAILABLE FOR SALE
Amortized Cost	$ 34,003	$ 26,810
Gross Unrealized Gains	595	804
Gross Unrealized Losses	675	58
Fair Value	33,923	27,556
HELD-TO-MATURITY SECURITIES
Amortized Cost	6,857	7,595
Gross Unrealized Gains	302	428
Gross Unrealized Losses	0	0
Fair Value	7,159	8,023
Accrued interest	242	241
U.S. Treasury, agencies and corporations
SECURITIES AVAILABLE FOR SALE
Amortized Cost	4,914	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	13	0
Fair Value	4,901	1,000
States and political subdivisions
SECURITIES AVAILABLE FOR SALE
Amortized Cost	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	0
Agency residential collateralized mortgage obligations
SECURITIES AVAILABLE FOR SALE
Amortized Cost	14,419	14,001
Gross Unrealized Gains	249	297
Gross Unrealized Losses	219	25
Fair Value	14,449	14,273
HELD-TO-MATURITY SECURITIES
Amortized Cost	3,312	3,775
Gross Unrealized Gains	107	124
Gross Unrealized Losses	0	0
Fair Value	3,419	3,899
Agency residential mortgage-backed securities
SECURITIES AVAILABLE FOR SALE
Amortized Cost	4,018	2,094
Gross Unrealized Gains	57	70
Gross Unrealized Losses	49	0
Fair Value	4,026	2,164
HELD-TO-MATURITY SECURITIES
Amortized Cost	238	271
Gross Unrealized Gains	9	14
Gross Unrealized Losses	0	0
Fair Value	247	285
Asset-backed securities
HELD-TO-MATURITY SECURITIES
Amortized Cost	16	19
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	16	19
Other securities
SECURITIES AVAILABLE FOR SALE
Amortized Cost	8	8
Gross Unrealized Gains	14	5
Gross Unrealized Losses		0
Fair Value	22	13
HELD-TO-MATURITY SECURITIES
Amortized Cost	16	15
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	16	15
Mortgage-backed securities | Agency commercial mortgage-backed securities
SECURITIES AVAILABLE FOR SALE
Amortized Cost	10,644	9,707
Gross Unrealized Gains	275	432
Gross Unrealized Losses	394	33
Fair Value	10,525	10,106
HELD-TO-MATURITY SECURITIES
Amortized Cost	3,275	3,515
Gross Unrealized Gains	186	290
Gross Unrealized Losses	0	0
Fair Value	3,461	3,805
Securities available for sale
HELD-TO-MATURITY SECURITIES
Accrued interest	49	42
Securities held-to-maturity
HELD-TO-MATURITY SECURITIES
Accrued interest	$ 14	$ 15

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