v3.26.1
Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate, Nonaccrual Loans and Other Credit Quality Indicators (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans $ 1,463,808 $ 1,345,473 $ 1,463,808 $ 1,345,473 $ 1,408,905
Consumer, excluding credit card          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 367,128 371,855 367,128 371,855 368,741
Consumer, excluding credit card | Residential real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Nonaccrual loans 3,615   3,615   3,632
Total retained loans $ 300,664   $ 300,664   $ 303,531
Weighted average LTV ratio 47.00%   47.00%   48.00%
Weighted average FICO 776   776   775
Approximate percentage of Chapter 7 loans 30 days or more past due     12.00%    
Interest income on nonaccrual loans recognized on a cash basis $ 37 $ 37 $ 73 $ 74  
Consumer, excluding credit card | Residential real estate | California          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 115,325   115,325   $ 117,500
Consumer, excluding credit card | Residential real estate | New York          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 46,074   46,074   46,378
Consumer, excluding credit card | Residential real estate | Florida          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 22,054   22,054   21,864
Consumer, excluding credit card | Residential real estate | Texas          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 14,422   14,422   14,398
Consumer, excluding credit card | Residential real estate | Massachusetts          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 12,837   12,837   12,985
Consumer, excluding credit card | Residential real estate | Colorado          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 10,423   10,423   10,316
Consumer, excluding credit card | Residential real estate | Washington          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 9,182   9,182   9,408
Consumer, excluding credit card | Residential real estate | Illinois          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 8,912   8,912   9,152
Consumer, excluding credit card | Residential real estate | New Jersey          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 7,464   7,464   7,486
Consumer, excluding credit card | Residential real estate | Connecticut          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 6,787   6,787   6,823
Consumer, excluding credit card | Residential real estate | All other          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 47,184   47,184   47,221
Consumer, excluding credit card | Residential real estate | No FICO/LTV available          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 712   712   690
Consumer, excluding credit card | Residential real estate | Greater than 125% and refreshed FICO scores | Equal to or greater than 660          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 109   109   71
Consumer, excluding credit card | Residential real estate | Greater than 125% and refreshed FICO scores | Less than 660          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 4   4   4
Consumer, excluding credit card | Residential real estate | Greater than 100% but less than or equal to 125% and refreshed FICO scores | Equal to or greater than 660          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 213   213   282
Consumer, excluding credit card | Residential real estate | Greater than 100% but less than or equal to 125% and refreshed FICO scores | Less than 660          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 5   5   5
Consumer, excluding credit card | Residential real estate | Greater than 80% but less than or equal to 100% and refreshed FICO scores | Equal to or greater than 660          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 6,958   6,958   5,990
Consumer, excluding credit card | Residential real estate | Greater than 80% but less than or equal to 100% and refreshed FICO scores | Less than 660          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 118   118   131
Consumer, excluding credit card | Residential real estate | Less than or equal to 80% and refreshed FICO scores | Equal to or greater than 660          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 284,082   284,082   287,923
Consumer, excluding credit card | Residential real estate | Less than or equal to 80% and refreshed FICO scores | Less than 660          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans $ 8,463   $ 8,463   $ 8,435