Fair Value Measurement - Carrying Value and Estimated Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Financial assets
Cash and due from banks	$ 27,215	$ 26,438
Deposits with banks	642,045	714,396
Federal funds sold and securities purchased under resale agreements	322,156	261,698
Investment securities, held-to-maturity	415,587	362,628
Loans, net of allowance for loan losses	47,056	58,820
Financial liabilities
Beneficial interests issued by consolidated VIEs	10,640	10,750
Carrying value
Financial assets
Cash and due from banks	27,200	26,400
Deposits with banks	642,000	714,400
Accrued interest and accounts receivable	144,500	102,100
Federal funds sold and securities purchased under resale agreements	3,000	9,000
Securities borrowed	128,400	124,600
Investment securities, held-to-maturity	441,600	363,700
Loans, net of allowance for loan losses	1,039,300	1,002,500
Other	113,200	98,700
Financial liabilities
Deposits	2,458,300	2,451,000
Federal funds purchased and securities loaned or sold under repurchase agreements	66,400	67,900
Accounts payable and other liabilities	272,700	217,600
Beneficial interests issued by consolidated VIEs	10,600	10,700
Long-term debt	222,100	226,000
Wholesale lending-related commitments	2,200	2,100
Carrying value | Short-term borrowings
Financial liabilities
Short-term borrowings	41,500	33,600
Total estimated fair value
Financial assets
Cash and due from banks	27,200	26,400
Deposits with banks	642,000	714,400
Accrued interest and accounts receivable	144,500	102,100
Federal funds sold and securities purchased under resale agreements	3,000	9,000
Securities borrowed	128,400	124,600
Investment securities, held-to-maturity	415,600	362,600
Loans, net of allowance for loan losses	1,028,100	1,023,200
Other	113,400	98,800
Financial liabilities
Deposits	2,458,400	2,451,000
Federal funds purchased and securities loaned or sold under repurchase agreements	66,400	67,900
Accounts payable and other liabilities	272,000	217,000
Beneficial interests issued by consolidated VIEs	10,600	10,800
Long-term debt	218,000	232,600
Wholesale lending-related commitments	3,400	2,900
Total estimated fair value | Short-term borrowings
Financial liabilities
Short-term borrowings	41,500	33,600
Total estimated fair value | Level 1
Financial assets
Cash and due from banks	27,200	26,400
Deposits with banks	642,000	714,400
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	212,900	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
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 1 | Short-term borrowings
Financial liabilities
Short-term borrowings	0	0
Total estimated fair value | Level 2
Financial assets
Cash and due from banks	0	0
Deposits with banks	0	0
Accrued interest and accounts receivable	144,400	102,000
Federal funds sold and securities purchased under resale agreements	3,000	9,000
Securities borrowed	128,400	124,600
Investment securities, held-to-maturity	202,700	179,300
Loans, net of allowance for loan losses	193,100	202,100
Other	111,800	97,400
Financial liabilities
Deposits	2,458,400	2,451,000
Federal funds purchased and securities loaned or sold under repurchase agreements	66,400	67,900
Accounts payable and other liabilities	266,700	212,100
Beneficial interests issued by consolidated VIEs	10,600	10,800
Long-term debt	214,900	229,500
Wholesale lending-related commitments	0	0
Total estimated fair value | Level 2 | Short-term borrowings
Financial liabilities
Short-term borrowings	41,500	33,600
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	835,000	821,100
Other	1,600	1,400
Financial liabilities
Deposits	0	0
Federal funds purchased and securities loaned or sold under repurchase agreements	0	0
Accounts payable and other liabilities	5,300	4,900
Beneficial interests issued by consolidated VIEs	0	0
Long-term debt	3,100	3,100
Wholesale lending-related commitments	3,400	2,900
Total estimated fair value | Level 3 | Short-term borrowings
Financial liabilities
Short-term borrowings	$ 0	$ 0