Fair Value Measurement - Carrying Value and Estimated Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Financial assets
Cash and due from banks	$ 27,697	$ 26,438
Deposits with banks	539,537	714,396
Federal funds sold and securities purchased under resale agreements	315,592	261,698
Investment securities, held-to-maturity	388,648	362,628
Loans, net of allowance for loan losses	42,079	58,820
Financial liabilities
Beneficial interests issued by consolidated VIEs	12,610	10,750
Carrying value
Financial assets
Cash and due from banks	27,700	26,400
Deposits with banks	539,500	714,400
Accrued interest and accounts receivable	124,700	102,100
Federal funds sold and securities purchased under resale agreements	3,700	9,000
Securities borrowed	115,300	124,600
Investment securities, held-to-maturity	425,300	363,700
Loans, net of allowance for loan losses	1,073,900	1,002,500
Other	101,200	98,700
Financial liabilities
Deposits	2,311,600	2,451,000
Federal funds purchased and securities loaned or sold under repurchase agreements	50,600	67,900
Short-term borrowings	28,200	33,600
Accounts payable and other liabilities	257,500	217,600
Beneficial interests issued by consolidated VIEs	12,600	10,700
Long-term debt	223,600	226,000
Wholesale lending-related commitments	2,300	2,100
Fair value
Financial assets
Cash and due from banks	27,700	26,400
Deposits with banks	539,500	714,400
Accrued interest and accounts receivable	124,700	102,100
Federal funds sold and securities purchased under resale agreements	3,700	9,000
Securities borrowed	115,300	124,600
Investment securities, held-to-maturity	388,600	362,600
Loans, net of allowance for loan losses	1,047,900	1,023,200
Other	101,300	98,800
Financial liabilities
Deposits	2,311,500	2,451,000
Federal funds purchased and securities loaned or sold under repurchase agreements	50,600	67,900
Short-term borrowings	28,200	33,600
Accounts payable and other liabilities	256,800	217,000
Beneficial interests issued by consolidated VIEs	12,600	10,800
Long-term debt	219,300	232,600
Wholesale lending-related commitments	3,200	2,900
Fair value | Level 1
Financial assets
Cash and due from banks	27,700	26,400
Deposits with banks	539,300	714,100
Accrued interest and accounts receivable	0	0
Federal funds sold and securities purchased under resale agreements	0	0
Securities borrowed	0	0
Investment securities, held-to-maturity	189,100	183,300
Loans, net of allowance for loan losses	0	0
Other	0	0
Financial liabilities
Deposits	0	0
Federal funds purchased and securities loaned or sold under repurchase agreements	0	0
Short-term borrowings	0	0
Accounts payable and other liabilities	0	0
Beneficial interests issued by consolidated VIEs	0	0
Long-term debt	0	0
Wholesale lending-related commitments	0	0
Fair value | Level 2
Financial assets
Cash and due from banks	0	0
Deposits with banks	200	300
Accrued interest and accounts receivable	124,600	102,000
Federal funds sold and securities purchased under resale agreements	3,700	9,000
Securities borrowed	115,300	124,600
Investment securities, held-to-maturity	199,500	179,300
Loans, net of allowance for loan losses	194,000	202,100
Other	99,600	97,400
Financial liabilities
Deposits	2,311,500	2,451,000
Federal funds purchased and securities loaned or sold under repurchase agreements	50,600	67,900
Short-term borrowings	28,200	33,600
Accounts payable and other liabilities	251,200	212,100
Beneficial interests issued by consolidated VIEs	12,600	10,800
Long-term debt	216,500	229,500
Wholesale lending-related commitments	0	0
Fair value | Level 3
Financial assets
Cash and due from banks	0	0
Deposits with banks	0	0
Accrued interest and accounts receivable	100	100
Federal funds sold and securities purchased under resale agreements	0	0
Securities borrowed	0	0
Investment securities, held-to-maturity	0	0
Loans, net of allowance for loan losses	853,900	821,100
Other	1,700	1,400
Financial liabilities
Deposits	0	0
Federal funds purchased and securities loaned or sold under repurchase agreements	0	0
Short-term borrowings	0	0
Accounts payable and other liabilities	5,600	4,900
Beneficial interests issued by consolidated VIEs	0	0
Long-term debt	2,800	3,100
Wholesale lending-related commitments	$ 3,200	$ 2,900