Loans - Wholesale Loan Portfolio, Financial Effects of FDMs (Details) - Wholesale - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Secured by real estate
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 62	$ 77	$ 77	$ 85
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 27	$ 68	$ 28	$ 71
% of total modifications to total retained credit card loans	0.02%	0.04%	0.02%	0.04%
Weighted-average term loan extensions	5 months	9 months	5 months	9 months
Secured by real estate \| Other-than-insignificant payment delay and interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 35		$ 48
% of total modifications to total retained credit card loans	0.02%		0.03%
Weighted-average contractual interest rate reduction	1.85%		1.62%
Secured by real estate \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 0	$ 9	$ 1	$ 14
% of total modifications to total retained credit card loans	0.00%	0.00%	0.00%	0.00%
Commercial and industrial
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 644	$ 312	$ 1,041	$ 469
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 460	$ 306	$ 754	$ 423
% of total modifications to total retained credit card loans	0.28%	0.18%	0.45%	0.25%
Weighted-average term loan extensions	12 months	8 months	13 months	10 months
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 162		$ 166
% of total modifications to total retained credit card loans	0.10%		0.10%
Commercial and industrial \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 20		$ 115
% of total modifications to total retained credit card loans	0.01%		0.07%
Weighted-average term loan extensions	19 months		20 months
Commercial and industrial \| Term extension and principal forgiveness
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 0		$ 40
% of total modifications to total retained credit card loans		0.00%		0.02%
Weighted-average term loan extensions				64 months
Reduction in amortized cost basis				$ 23
Commercial and industrial \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 2	$ 6	$ 6	$ 6
% of total modifications to total retained credit card loans	0.00%	0.00%	0.00%	0.00%
Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 34	$ 284	$ 44	$ 300
Other \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 19	$ 38	$ 29	$ 54
% of total modifications to total retained credit card loans	0.01%	0.01%	0.01%	0.02%
Weighted-average term loan extensions	7 months	3 months	11 months	6 months
Other \| Interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 11		$ 11
% of total modifications to total retained credit card loans		0.00%		0.00%
Weighted-average contractual interest rate reduction		6.54%		6.54%
Other \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 13		$ 13
% of total modifications to total retained credit card loans	0.00%		0.00%
Other \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 235		$ 235
% of total modifications to total retained credit card loans		0.07%		0.07%
Weighted-average term loan extensions		144 months		144 months
Other \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 2		$ 2
% of total modifications to total retained credit card loans	0.00%		0.00%

Amount of increase (decrease) in amortized cost excluding accrued interest, of financing receivable modified for debtor experiencing financial difficulty.

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