Loans - Wholesale Loan Portfolio, Information on FDMs and Payment Status (Details) - Wholesale - Commercial and industrial $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 373
Criticized nonaccrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	157
Current and less than 30 days past due and still accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	212
30–89 days past due and still accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	4
90 or more days past due and still accruing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	0
Term extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 280
% of loan modifications to total retained credit card loans	0.17%
Weighted-average term loan extensions	8 months
Other-than-insignificant payment delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 49
% of loan modifications to total retained credit card loans	0.03%
Term extension and principal forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized cost basis	$ 44
% of loan modifications to total retained credit card loans	0.03%
Weighted-average term loan extensions	64 months
Reduction in amortized cost basis	$ 23