v3.26.3
Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate, Nonaccrual Loans and Other Credit Quality Indicators (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans $ 1,497,159 $ 1,369,785 $ 1,497,159 $ 1,369,785 $ 1,408,905
Consumer, excluding credit card          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 367,206 369,859 367,206 369,859 368,741
Consumer, excluding credit card | Residential real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Nonaccrual loans 3,618   3,618   3,632
Total retained loans $ 299,642   $ 299,642   $ 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     10.00%    
Interest income on nonaccrual loans recognized on a cash basis $ 37 $ 35 $ 110 $ 109  
Consumer, excluding credit card | Residential real estate | California          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 114,374   114,374   $ 117,500
Consumer, excluding credit card | Residential real estate | New York          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 45,992   45,992   46,378
Consumer, excluding credit card | Residential real estate | Florida          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 22,421   22,421   21,864
Consumer, excluding credit card | Residential real estate | Texas          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 14,401   14,401   14,398
Consumer, excluding credit card | Residential real estate | Massachusetts          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 12,697   12,697   12,985
Consumer, excluding credit card | Residential real estate | Colorado          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 10,413   10,413   10,316
Consumer, excluding credit card | Residential real estate | Washington          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 9,133   9,133   9,408
Consumer, excluding credit card | Residential real estate | Illinois          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 8,823   8,823   9,152
Consumer, excluding credit card | Residential real estate | New Jersey          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 7,482   7,482   7,486
Consumer, excluding credit card | Residential real estate | Connecticut          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 6,855   6,855   6,823
Consumer, excluding credit card | Residential real estate | All other          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 47,051   47,051   47,221
Consumer, excluding credit card | Residential real estate | No FICO/LTV available          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total retained loans 587   587   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 81   81   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 260   260   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 6,877   6,877   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 130   130   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 283,384   283,384   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 $ 8,314   $ 8,314   $ 8,435