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Loans - Financing Receivable, Modified - Modification to Borrowers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 2,748	$ 2,860
% of total class of receivables	0.84%	0.89%
Principal balance reduction			$ 2,252
Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 693	$ 687
Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	1,089	970
Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	36	21
Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified		11
Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	788	711
Other
Financing Receivable, Past Due [Line Items]
Total loans modified	142	460
Credit Card:
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 702	$ 699
% of total class of receivables	0.43%	0.45%
Principal balance reduction			433
Credit Card: | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 693	$ 687
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: | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified		0
Credit Card: | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	9	12
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	$ 579	$ 602
% of total class of receivables	0.37%	0.41%
Credit Card: | Domestic Card | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 570	$ 590
Weighted-average interest rate reduction	20.12%	19.32%
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 years
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 | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified		0
Credit Card: | Domestic Card | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	9	12
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	$ 123	$ 97
% of total class of receivables	1.79%	1.41%
Credit Card: | International card businesses | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 123	$ 97
Weighted-average interest rate reduction	26.71%	27.10%
Credit Card: | International card businesses | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
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 | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified		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	$ 728	$ 772
% of total class of receivables	0.93%	1.02%
Principal balance reduction			1,077
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	37	71
Consumer Banking: | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	21	21
Consumer Banking: | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified		0
Consumer Banking: | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	665	673
Consumer Banking: | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	5	7
Consumer Banking: | Auto
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 722	$ 762
% of total class of receivables	0.94%	1.03%
Principal balance reduction			1,070
Consumer Banking: | Auto | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Weighted-average interest rate reduction	8.83%	8.72%
Consumer Banking: | Auto | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 32	$ 65
Payment delay duration (in months)	6 months	6 years
Consumer Banking: | Auto | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 21	$ 21
Principal balance reduction	1	1
Consumer Banking: | Auto | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified		0
Consumer Banking: | Auto | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	665	672
Consumer Banking: | Auto | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	4	4
Consumer Banking: | Retail banking
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 6	$ 10
% of total class of receivables	0.48%	0.74%
Principal balance reduction			7
Consumer Banking: | Retail banking | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Weighted-average interest rate reduction	3.48%	2.00%
Consumer Banking: | Retail banking | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 5	$ 6
Payment delay duration (in months)	3 months	10 years
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 | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified		0
Consumer Banking: | Retail banking | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	1
Consumer Banking: | Retail banking | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	1	3
Commercial Banking:
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 1,318	$ 1,389
% of total class of receivables	1.51%	1.54%
Principal balance reduction			742
Commercial Banking: | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Commercial Banking: | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	1,052	899
Commercial Banking: | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	15	0
Commercial Banking: | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified		11
Commercial Banking: | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	114	26
Commercial Banking: | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	137	453
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 539	$ 465
% of total class of receivables	1.69%	1.35%
Principal balance reduction			385
Commercial Banking: | Commercial and multifamily real estate | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Weighted-average interest rate reduction	0.79%	0.00%
Commercial Banking: | Commercial and multifamily real estate | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 471	$ 463
Payment delay duration (in months)	10 months	13 years
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	20
Commercial Banking: | Commercial and multifamily real estate | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified		0
Commercial Banking: | Commercial and multifamily real estate | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0	0
Commercial Banking: | Commercial and multifamily real estate | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	68	2
Commercial Banking: | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 779	$ 924
% of total class of receivables	1.41%	1.65%
Principal balance reduction			$ 357
Commercial Banking: | Commercial and industrial | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0	$ 0
Weighted-average interest rate reduction	1.90%	0.25%
Commercial Banking: | Commercial and industrial | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 581	$ 436
Payment delay duration (in months)	16 months	7 years
Commercial Banking: | Commercial and industrial | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 15	$ 0
Principal balance reduction	15	3
Commercial Banking: | Commercial and industrial | Principal balance reduction and term extension
Financing Receivable, Past Due [Line Items]
Total loans modified		11
Commercial Banking: | Commercial and industrial | Interest Rate Reduction and Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	114	26
Commercial Banking: | Commercial and industrial | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 69	$ 451

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- Definition

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