Fair Value Measurement - Carrying Value and Estimated Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financial assets
Cash and due from banks	$ 25,098	$ 27,697
Deposits with banks	520,902	539,537
Federal funds sold and securities purchased under resale agreements	317,111	315,592
Investment securities, held-to-maturity	381,990	388,648
Loans, net of allowance for loan losses	38,546	42,079
Financial liabilities
Beneficial interests issued by consolidated VIEs	14,903	12,610
Carrying value
Financial assets
Cash and due from banks	25,100	27,700
Deposits with banks	520,900	539,500
Accrued interest and accounts receivable	114,800	124,700
Federal funds sold and securities purchased under resale agreements	7,800	3,700
Securities borrowed	127,400	115,300
Investment securities, held-to-maturity	412,800	425,300
Loans, net of allowance for loan losses	1,070,300	1,073,900
Other	102,400	101,200
Financial liabilities
Deposits	2,335,700	2,311,600
Federal funds purchased and securities loaned or sold under repurchase agreements	54,100	50,600
Short-term borrowings	24,200	28,200
Accounts payable and other liabilities	238,500	257,500
Beneficial interests issued by consolidated VIEs	14,900	12,600
Long-term debt	219,300	223,600
Wholesale lending-related commitments	2,300	2,300
Total estimated fair value
Financial assets
Cash and due from banks	25,100	27,700
Deposits with banks	520,900	539,500
Accrued interest and accounts receivable	114,800	124,700
Federal funds sold and securities purchased under resale agreements	7,800	3,700
Securities borrowed	127,400	115,300
Investment securities, held-to-maturity	382,000	388,600
Loans, net of allowance for loan losses	1,050,100	1,047,900
Other	102,500	101,300
Financial liabilities
Deposits	2,335,900	2,311,500
Federal funds purchased and securities loaned or sold under repurchase agreements	54,100	50,600
Short-term borrowings	24,200	28,200
Accounts payable and other liabilities	237,900	256,800
Beneficial interests issued by consolidated VIEs	14,900	12,600
Long-term debt	217,100	219,300
Wholesale lending-related commitments	3,200	3,200
Total estimated fair value | Level 1
Financial assets
Cash and due from banks	25,100	27,700
Deposits with banks	520,400	539,300
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	187,200	189,100
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
Total estimated fair value | Level 2
Financial assets
Cash and due from banks	0	0
Deposits with banks	500	200
Accrued interest and accounts receivable	114,700	124,600
Federal funds sold and securities purchased under resale agreements	7,800	3,700
Securities borrowed	127,400	115,300
Investment securities, held-to-maturity	194,800	199,500
Loans, net of allowance for loan losses	198,900	194,000
Other	100,800	99,600
Financial liabilities
Deposits	2,335,900	2,311,500
Federal funds purchased and securities loaned or sold under repurchase agreements	54,100	50,600
Short-term borrowings	24,200	28,200
Accounts payable and other liabilities	232,300	251,200
Beneficial interests issued by consolidated VIEs	14,900	12,600
Long-term debt	214,300	216,500
Wholesale lending-related commitments	0	0
Total estimated 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	851,200	853,900
Other	1,700	1,700
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	5,600
Beneficial interests issued by consolidated VIEs	0	0
Long-term debt	2,800	2,800
Wholesale lending-related commitments	$ 3,200	$ 3,200