v3.26.1
Loans and Allowance for Credit Losses - Composition of Loan Portfolio (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 410,300 $ 391,335
Percent of Total 100.00% 100.00%
Commercial | Total commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 159,655 $ 148,161
Percent of Total 38.90% 37.90%
Commercial | Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 155,160 $ 143,725
Percent of Total 37.80% 36.70%
Commercial | Lease financing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 4,495 $ 4,436
Percent of Total 1.10% 1.20%
Commercial | Total commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 52,348 $ 48,920
Percent of Total 12.80% 12.50%
Commercial | Commercial mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 42,700 $ 39,476
Percent of Total 10.40% 10.10%
Commercial | Construction and development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 9,648 $ 9,444
Percent of Total 2.40% 2.40%
Consumer | Total residential mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 117,311 $ 115,885
Percent of Total 28.60% 29.60%
Consumer | Residential mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 112,630 $ 110,788
Percent of Total 27.50% 28.30%
Consumer | Home equity loans, first liens    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 4,681 $ 5,097
Percent of Total 1.10% 1.30%
Consumer | Credit card    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 39,079 $ 38,031
Percent of Total 9.50% 9.70%
Consumer | Total other retail    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 41,907 $ 40,338
Percent of Total 10.20% 10.30%
Consumer | Retail leasing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 4,087 $ 3,524
Percent of Total 1.00% 0.90%
Consumer | Home equity and second mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 14,131 $ 14,025
Percent of Total 3.40% 3.60%
Consumer | Revolving credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 5,409 $ 4,561
Percent of Total 1.30% 1.20%
Consumer | Installment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 15,032 $ 14,653
Percent of Total 3.70% 3.70%
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount $ 3,248 $ 3,575
Percent of Total 0.80% 0.90%