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Loans - Credit Card Loan Portfolio, Delinquency Information (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total retained loans $ 1,273,047 $ 1,255,688 $ 1,280,870
Total gross charge-offs 5,107 $ 3,227  
Credit card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Revolving loans within the revolving period 214,873   210,117
Revolving loans converted to term loans 1,227   1,006
Total retained loans $ 216,100   $ 211,123
% of 30 plus days past due to total retained loans, Revolving loans within the revolving period 2.02%   2.09%
% of 30 plus days past due to total retained loans, Revolving loans converted to term loans 11.82%   12.33%
% of 30 plus days past due to total retained loans 2.08%   2.14%
% of 90 plus days past due to total retained loans, Revolving loans within the revolving period 1.05%   1.03%
% of 90 plus days past due to total retained loans, Revolving loans converted to term loans 4.32%   3.98%
% of 90 plus days past due to total retained loans 1.07%   1.05%
Gross charge-offs originated within the revolving period $ 3,885   $ 5,325
Gross charge-offs originated converted to term loans 113   166
Total gross charge-offs 3,998   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 210,533   205,731
Revolving loans converted to term loans 1,082   882
Total retained loans 211,615   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 2,083   2,217
Revolving loans converted to term loans 92   84
Total retained loans 2,175   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 2,257   2,169
Revolving loans converted to term loans 53   40
Total retained loans $ 2,310   $ 2,209