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Loans - Trouble Debt Restructurings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Principal balance reduction	$ 2,252
Commitments to lend on loans modified in TDRs		$ 334	$ 109
Credit Card:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Principal balance reduction	$ 433
Credit Card: | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%
Financing Receivable, Modifications, Average Rate Reduction	19.73%
Consumer Banking:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Principal balance reduction	$ 1,077
Consumer Banking: | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	57.00%
Financing Receivable, Modifications, Average Rate Reduction	8.53%
Consumer Banking: | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	97.00%
Financing Receivable, Modifications, Average Term Extension	4 months
Consumer Banking: | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Principal balance reduction	$ 1,070
Consumer Banking: | Auto | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	57.00%
Financing Receivable, Modifications, Average Rate Reduction	8.53%
Commitments to lend on loans modified in TDRs	$ 219
Consumer Banking: | Auto | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	97.00%
Financing Receivable, Modifications, Average Term Extension	4 months
Consumer Banking: | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Principal balance reduction	$ 7
Consumer Banking: | Retail banking | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	92.00%
Financing Receivable, Modifications, Average Term Extension	13 months
Commercial Banking:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Principal balance reduction	$ 742
Commercial Banking: | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	4.00%
Financing Receivable, Modifications, Average Rate Reduction	0.28%
Commercial Banking: | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	74.00%
Financing Receivable, Modifications, Average Term Extension	13 months
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Principal balance reduction	$ 385
Commercial Banking: | Commercial and multifamily real estate | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	8.00%
Financing Receivable, Modifications, Average Rate Reduction	0.28%
Commercial Banking: | Commercial and multifamily real estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	84.00%
Financing Receivable, Modifications, Average Term Extension	13 months
Commercial Banking: | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Principal balance reduction	$ 357
Commercial Banking: | Commercial and industrial | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	64.00%
Financing Receivable, Modifications, Average Term Extension	13 months
Domestic credit card: | Credit Card:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Principal balance reduction	$ 306
Domestic credit card: | Credit Card: | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%
Financing Receivable, Modifications, Average Rate Reduction	16.54%
International card businesses: | Credit Card:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Principal balance reduction	$ 127
International card businesses: | Credit Card: | Interest rate reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
% of TDR Activity	100.00%
Financing Receivable, Modifications, Average Rate Reduction	27.42%

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