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Loans - Credit Card Loan Portfolio, Delinquency Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 1,264,093 $ 1,084,850 $ 1,280,870
Total gross charge-offs 2,381 $ 1,451  
Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Revolving loans within the revolving period 205,620   210,117
Revolving loans converted to term loans 1,120   1,006
Total retained loans $ 206,740   $ 211,123
% of 30 plus days past due to total retained loans, Revolving loans within the revolving period 2.17%   2.09%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans 13.04%   12.33%
% of 30 plus days past due to total retained loans 2.23%   2.14%
% of 90 plus days past due to total retained loans, Revolving loans within the revolving period 1.14%   1.03%
% of 90 plus days past due to total retained loans, Revolving loans converted to term loans 4.73%   3.98%
% of 90 plus days past due to total retained loans 1.16%   1.05%
Gross charge-offs originated within the revolving period $ 1,860   $ 5,325
Gross charge-offs originated converted to term loans 54   166
Total gross charge-offs 1,914   5,491
Credit card | Current and less than 30 days past due and still accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Revolving loans within the revolving period 201,163   205,731
Revolving loans converted to term loans 974   882
Total retained loans 202,137   206,613
Credit card | 30–89 days past due and still accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Revolving loans within the revolving period 2,106   2,217
Revolving loans converted to term loans 93   84
Total retained loans 2,199   2,301
Credit card | 90 or more days past due and still accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Revolving loans within the revolving period 2,351   2,169
Revolving loans converted to term loans 53   40
Total retained loans $ 2,404   $ 2,209