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Loans - Financing Receivable, Modified - Modification to Borrowers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 1,116	$ 1,183
% of total class of receivables	0.35%	0.38%
Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 247	$ 270
Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	447	459
Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	9	9
Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	273	307
Other
Financing Receivable, Past Due [Line Items]
Total loans modified	140	138
Credit Card:
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 232	$ 275
% of total class of receivables	0.15%	0.18%
Credit Card: | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 228	$ 270
Credit Card: | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0
Credit Card: | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0
Credit Card: | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	4	5
Credit Card: | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0
Credit Card: | Domestic Card
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 175	$ 221
% of total class of receivables	0.12%	0.15%
Credit Card: | Domestic Card | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 171	$ 216
Weighted-average interest rate reduction	19.38%	19.99%
Credit Card: | Domestic Card | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Payment delay duration (in months)	12 months	12 months
Credit Card: | Domestic Card | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Principal balance reduction	0	0
Credit Card: | Domestic Card | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	4	5
Credit Card: | Domestic Card | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0
Credit Card: | International card businesses
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 57	$ 54
% of total class of receivables	0.83%	0.80%
Credit Card: | International card businesses | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 57	$ 54
Weighted-average interest rate reduction	25.30%	26.12%
Credit Card: | International card businesses | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Payment delay duration (in months)	0 months	0 months
Credit Card: | International card businesses | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Principal balance reduction	0	0
Credit Card: | International card businesses | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0
Credit Card: | International card businesses | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0
Consumer Banking:
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 315	$ 292
% of total class of receivables	0.40%	0.39%
Consumer Banking: | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Consumer Banking: | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	36	8
Consumer Banking: | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	9	9
Consumer Banking: | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	269	274
Consumer Banking: | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	1	1
Consumer Banking: | Auto
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 312	$ 290
% of total class of receivables	0.40%	0.39%
Consumer Banking: | Auto | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Weighted-average interest rate reduction	9.03%	8.65%
Consumer Banking: | Auto | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 33	$ 6
Payment delay duration (in months)	6 months	6 months
Consumer Banking: | Auto | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 9	$ 9
Principal balance reduction	0	0
Consumer Banking: | Auto | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	269	274
Consumer Banking: | Auto | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	1	1
Consumer Banking: | Retail banking
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 3	$ 2
% of total class of receivables	0.21%	0.14%
Consumer Banking: | Retail banking | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Weighted-average interest rate reduction	0.00%	0.00%
Consumer Banking: | Retail banking | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 3	$ 2
Payment delay duration (in months)	5 months	10 months
Consumer Banking: | Retail banking | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Principal balance reduction	0	0
Consumer Banking: | Retail banking | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0
Consumer Banking: | Retail banking | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0
Commercial Banking:
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 569	$ 616
% of total class of receivables	0.65%	0.69%
Commercial Banking: | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 19	$ 0
Commercial Banking: | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	411	451
Commercial Banking: | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0
Commercial Banking: | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	28
Commercial Banking: | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	139	137
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 245	$ 435
% of total class of receivables	0.77%	1.27%
Commercial Banking: | Commercial and multifamily real estate | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 3	$ 0
Weighted-average interest rate reduction	0.85%	0.79%
Commercial Banking: | Commercial and multifamily real estate | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 210	$ 316
Payment delay duration (in months)	11 months	6 months
Commercial Banking: | Commercial and multifamily real estate | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Principal balance reduction	0	0
Commercial Banking: | Commercial and multifamily real estate | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	28
Commercial Banking: | Commercial and multifamily real estate | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	32	91
Commercial Banking: | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 324	$ 181
% of total class of receivables	0.58%	0.33%
Commercial Banking: | Commercial and industrial | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 16	$ 0
Weighted-average interest rate reduction	0.25%	0.00%
Commercial Banking: | Commercial and industrial | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 201	$ 135
Payment delay duration (in months)	21 months	12 months
Commercial Banking: | Commercial and industrial | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Principal balance reduction	0	15
Commercial Banking: | Commercial and industrial | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0
Commercial Banking: | Commercial and industrial | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 107	$ 46

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- Definition

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