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Loans - Financing Receivable, Modified - Modification to Borrowers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 2,860
% of total class of receivables	0.89%
Principal balance reduction		$ 2,252	$ 812
Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 687
Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	970
Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	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	711
Other
Financing Receivable, Past Due [Line Items]
Total loans modified	460
Credit Card:
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 699
% of total class of receivables	0.45%
Principal balance reduction		433	277
Credit Card: | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 687
Credit Card: | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0
Credit Card: | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	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	12
Credit Card: | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	0
Credit Card: | Domestic Card
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 602
% of total class of receivables	0.41%
Credit Card: | Domestic Card | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Weighted-average interest rate reduction	19.32%
Total loans modified	$ 590
Credit Card: | Domestic Card | Term Extension
Financing Receivable, Past Due [Line Items]
Payment delay duration (in months)	12 years
Total loans modified	$ 0
Credit Card: | Domestic Card | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	0
Principal balance reduction	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	12
Credit Card: | Domestic Card | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	0
Credit Card: | International card businesses
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 97
% of total class of receivables	1.41%
Credit Card: | International card businesses | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Weighted-average interest rate reduction	27.10%
Total loans modified	$ 97
Credit Card: | International card businesses | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	0
Credit Card: | International card businesses | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	0
Principal balance reduction	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
Credit Card: | International card businesses | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	0
Consumer Banking:
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 772
% of total class of receivables	1.02%
Principal balance reduction		1,077	374
Consumer Banking: | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0
Consumer Banking: | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	71
Consumer Banking: | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	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	673
Consumer Banking: | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	7
Consumer Banking: | Auto
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 762
% of total class of receivables	1.03%
Principal balance reduction		1,070	371
Consumer Banking: | Auto | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Weighted-average interest rate reduction	8.72%
Total loans modified	$ 0
Consumer Banking: | Auto | Term Extension
Financing Receivable, Past Due [Line Items]
Payment delay duration (in months)	5 years 11 months 4 days
Total loans modified	$ 65
Consumer Banking: | Auto | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	21
Principal balance reduction	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	672
Consumer Banking: | Auto | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	4
Consumer Banking: | Retail banking
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 10
% of total class of receivables	0.74%
Principal balance reduction		7	3
Consumer Banking: | Retail banking | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Weighted-average interest rate reduction	2.00%
Total loans modified	$ 0
Consumer Banking: | Retail banking | Term Extension
Financing Receivable, Past Due [Line Items]
Payment delay duration (in months)	10 years 4 months 6 days
Total loans modified	$ 6
Consumer Banking: | Retail banking | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	0
Principal balance reduction	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	1
Consumer Banking: | Retail banking | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	3
Commercial Banking:
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 1,389
% of total class of receivables	1.54%
Principal balance reduction		742	161
Commercial Banking: | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 0
Commercial Banking: | Term Extension
Financing Receivable, Past Due [Line Items]
Total loans modified	899
Commercial Banking: | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	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	26
Commercial Banking: | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	453
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 465
% of total class of receivables	1.35%
Principal balance reduction		385	49
Commercial Banking: | Commercial and multifamily real estate | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Weighted-average interest rate reduction	0.00%
Total loans modified	$ 0
Commercial Banking: | Commercial and multifamily real estate | Term Extension
Financing Receivable, Past Due [Line Items]
Payment delay duration (in months)	13 years 4 months 17 days
Total loans modified	$ 463
Commercial Banking: | Commercial and multifamily real estate | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	0
Principal balance reduction	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
Commercial Banking: | Commercial and multifamily real estate | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	2
Commercial Banking: | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 924
% of total class of receivables	1.65%
Principal balance reduction		$ 357	$ 112
Commercial Banking: | Commercial and industrial | Interest rate reduction
Financing Receivable, Past Due [Line Items]
Weighted-average interest rate reduction	0.25%
Total loans modified	$ 0
Commercial Banking: | Commercial and industrial | Term Extension
Financing Receivable, Past Due [Line Items]
Payment delay duration (in months)	6 years 9 months 14 days
Total loans modified	$ 436
Commercial Banking: | Commercial and industrial | Principal balance reduction
Financing Receivable, Past Due [Line Items]
Total loans modified	0
Principal balance reduction	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	26
Commercial Banking: | Commercial and industrial | Other
Financing Receivable, Past Due [Line Items]
Total loans modified	$ 451

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- Definition

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

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