Loans and Related Allowance for Credit Losses, Loans Outstanding (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 947,991	$ 911,807	$ 955,871
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Deferred income as a percentage of total loans outstanding	1.00%		1.00%
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 554,217		$ 557,516
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable, accrued interest, writeoff	9	12
Total Commercial [Member] | Non-U.S. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	84,222		87,270
Total Commercial [Member] | Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	384,690		386,806
Total Commercial [Member] | Commercial and industrial loans [Member] | Non-U.S. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	75,851		78,981
Total Commercial [Member] | Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	154,707		155,802
Total Commercial [Member] | Commercial real estate [Member] | Non-U.S. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	7,698		7,619
Total Commercial [Member] | Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	14,820		14,908
Total Commercial [Member] | Lease financing [Member] | Non-U.S. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	673		670
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	393,774		398,355
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable, accrued interest, writeoff	55	$ 32
Total Consumer [Member] | Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	267,138		269,117
Total Consumer [Member] | Credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	45,766		46,293
Total Consumer [Member] | Auto [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	52,631		53,669
Total Consumer [Member] | Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 28,239		$ 29,276