Investment Securities - Summary of Components and Unrealized Losses on Held-to-Maturity Securities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
AFS securities transferred to HTM securities	$ 8,800
AFS securities transferred to HTM securities, unrealized gains (losses)	132
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	98,202	$ 16,592
Unrealized Gains	368	628
Unrealized Losses	(1,343)	(3)
Fair Value	97,227	17,217
Allowance for credit losses	7	0	$ 1
U.S. agency debentures
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	609	402
Unrealized Gains	8	19
Unrealized Losses	(2)	0
Fair Value	615	421
Allowance for credit losses	0	0
Residential mortgage-backed securities \| Agency-issued mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	64,439	7,740
Unrealized Gains	124	240
Unrealized Losses	(887)	(2)
Fair Value	63,676	7,978
Allowance for credit losses	0	0
Residential mortgage-backed securities \| Agency-issued collateralized mortgage obligations - fixed rate
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	10,226	1,735
Unrealized Gains	9	23
Unrealized Losses	(145)	0
Fair Value	10,090	1,758
Allowance for credit losses	0	0
Residential mortgage-backed securities \| Variable rate
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	100	137
Unrealized Gains	1	1
Unrealized Losses	0	0
Fair Value	101	138
Allowance for credit losses	0	0
Agency-issued commercial mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	14,959	2,943
Unrealized Gains	39	124
Unrealized Losses	(277)	0
Fair Value	14,721	3,067
Allowance for credit losses	0	0
Municipal bonds and notes
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	7,157	3,635
Unrealized Gains	185	221
Unrealized Losses	(27)	(1)
Fair Value	7,315	3,855
Allowance for credit losses	1	0
Corporate bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	712	$ 0
Unrealized Gains	2
Unrealized Losses	(5)
Fair Value	709
Allowance for credit losses	$ 6

Available-for-sale Securities, Transferred to Held-to-maturity Securities

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Available-for-sale Securities, Transferred to Held-to-maturity Securities, Unrealized Gain (Loss)

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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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