Loans - Wholesale Loan Portfolio, Financial Effects of FDMs (Details) - Wholesale - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Secured by real estate
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 336	$ 62	$ 643	$ 77
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 336	$ 27	$ 585	$ 28
% of loan modifications to total retained credit card loans	0.20%	0.02%	0.36%	0.02%
Weighted-average term loan extensions	21 months	5 months	17 months	5 months
Secured by real estate \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 0		$ 42
% of loan modifications to total retained credit card loans	0.00%		0.03%
Weighted-average term loan extensions			35 months
Secured by real estate \| Other-than-insignificant payment deferral and interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 35		$ 48
% of loan 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	$ 0	$ 16	$ 1
% of loan modifications to total retained credit card loans	0.00%	0.00%	0.01%	0.00%
Commercial and industrial
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 1,030	$ 644	$ 1,487	$ 1,041
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 624	$ 460	$ 835	$ 754
% of loan modifications to total retained credit card loans	0.36%	0.28%	0.48%	0.45%
Weighted-average term loan extensions	16 months	12 months	19 months	13 months
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 172	$ 162	$ 418	$ 166
% of loan modifications to total retained credit card loans	0.10%	0.10%	0.24%	0.10%
Commercial and industrial \| Other-than-insignificant payment deferral and interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 90		$ 90
% of loan modifications to total retained credit card loans	0.05%		0.05%
Weighted-average term loan extensions	15 months		15 months
Weighted-average contractual interest rate reduction	10.76%		10.76%
Commercial and industrial \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 82		$ 82
% of loan modifications to total retained credit card loans	0.05%		0.05%
Weighted-average term loan extensions	26 months		26 months
Weighted-average contractual interest rate reduction	6.55%		6.52%
Commercial and industrial \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 47	$ 20	$ 47	$ 115
% of loan modifications to total retained credit card loans	0.03%	0.01%	0.03%	0.07%
Weighted-average term loan extensions	26 months	19 months	26 months	20 months
Commercial and industrial \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 15	$ 2	$ 15	$ 6
% of loan modifications to total retained credit card loans	0.01%	0.00%	0.01%	0.00%
Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 112	$ 34	$ 143	$ 44
Other \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 109	$ 19	$ 140	$ 29
% of loan modifications to total retained credit card loans	0.03%	0.01%	0.03%	0.01%
Weighted-average term loan extensions	6 months	7 months	9 months	11 months
Other \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 3	$ 15	$ 3	$ 15
% of loan modifications to total retained credit card loans	0.00%	0.00%	0.00%	0.00%

Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty.

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