v3.26.1
Credit Quality and the Allowance for Loan and Lease Losses - Summary of Amortized Cost Basis of Modifications to Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Allowance for Credit Losses    
Financing receivable, excluding accrued interest, modified in period, amount $ 362 $ 254
Commercial    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty 23 41
Financing receivable, excluding accrued interest, modified in period, amount 334 224
Commercial | Term Extension    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty 23 0
Financing receivable, excluding accrued interest, modified in period, amount 302 87
Commercial | Payment Delay    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty 0 11
Financing receivable, excluding accrued interest, modified in period, amount 0 107
Commercial | Term Extension and Payment Delay    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty 0 30
Commercial | Commercial and industrial loans    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty 23 17
Financing receivable, excluding accrued interest, modified in period, amount 289 121
Commercial | Commercial and industrial loans | Term Extension    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty 23 0
Financing receivable, excluding accrued interest, modified in period, amount 258 50
Commercial | Commercial and industrial loans | Payment Delay    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty 0 11
Financing receivable, excluding accrued interest, modified in period, amount 0 65
Commercial | Commercial and industrial loans | Term Extension and Payment Delay    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty 0 6
Commercial | Commercial mortgage owner-occupied loans    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty 0 24
Financing receivable, excluding accrued interest, modified in period, amount 9 29
Commercial | Commercial mortgage owner-occupied loans | Term Extension    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty 0 0
Financing receivable, excluding accrued interest, modified in period, amount 9 5
Commercial | Commercial mortgage owner-occupied loans | Payment Delay    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty 0 0
Financing receivable, excluding accrued interest, modified in period, amount 0 0
Commercial | Commercial mortgage owner-occupied loans | Term Extension and Payment Delay    
Financing Receivable, Allowance for Credit Losses    
Amortized cost basis of the modifications to borrowers experiencing financial difficulty $ 0 $ 24