Loans - Wholesale Loan Portfolio, Financial Effects of FDMs (Details) - Wholesale - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Secured by real estate
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 271	$ 60	$ 327	$ 125
Secured by real estate \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 267	$ 60	$ 271	$ 112
% of total modifications to total retained credit card loans	0.16%	0.04%	0.17%	0.07%
Weighted-average term loan extensions	14 months	14 months	14 months	13 months
Secured by real estate \| Other-than-insignificant payment deferral and interest rate reduction
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 0		$ 47
% of total modifications to total retained credit card loans	0.00%		0.03%
Weighted-average contractual interest rate reduction			1.62%
Secured by real estate \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 4	$ 0	$ 9	$ 13
% of total 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	$ 664	$ 715	$ 1,348	$ 1,028
Commercial and industrial \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 443	$ 372	$ 880	$ 669
% of total modifications to total retained credit card loans	0.27%	0.22%	0.54%	0.40%
Weighted-average term loan extensions	15 months	21 months	17 months	19 months
Commercial and industrial \| Other-than-insignificant payment deferral
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 215	$ 309	$ 315	$ 310
% of total modifications to total retained credit card loans	0.13%	0.19%	0.19%	0.19%
Commercial and industrial \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 1	$ 32	$ 127	$ 32
% of total modifications to total retained credit card loans	0.00%	0.02%	0.08%	0.02%
Weighted-average term loan extensions	23 months	6 months	22 months	6 months
Commercial and industrial \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 5	$ 2	$ 26	$ 17
% of total modifications to total retained credit card loans	0.00%	0.00%	0.02%	0.01%
Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 260	$ 595	$ 288	$ 837
Other \| Term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 260	$ 100	$ 282	$ 100
% of total modifications to total retained credit card loans	0.07%	0.03%	0.08%	0.03%
Weighted-average term loan extensions	30 months	27 months	29 months	30 months
Other \| Interest rate reduction and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 495		$ 495
% of total modifications to total retained credit card loans		0.14%		0.14%
Weighted-average term loan extensions		7 months		7 months
Weighted-average contractual interest rate reduction		17.08%		17.08%
Other \| Other-than-insignificant payment deferral and term extension
Financing Receivable, Modified [Line Items]
Amortized cost basis		$ 0		$ 233
% of total modifications to total retained credit card loans		0.00%		0.07%
Weighted-average term loan extensions				144 months
Other \| Other
Financing Receivable, Modified [Line Items]
Amortized cost basis	$ 0	$ 0	$ 6	$ 9
% of total modifications to total retained credit card loans	0.00%	0.00%	0.00%	0.00%

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