v3.25.2
Loans and allowance for loan losses - Summary of loans in Accrual and Nonaccrual Status (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one $ 11,816   $ 11,816   $ 19,234
Year two 16,463   16,463   15,083
Year three 13,285   13,285   17,786
Year four 16,150   16,150   11,704
Year five 10,573   10,573   8,328
Prior 32,922   32,922   28,783
Total [1] 136,116   136,116   135,581
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one 11   12    
Year two 17   34    
Year three 21   43    
Year four 22   42    
Year five 8   20    
Prior 32   76    
Total 156 $ 180 316 $ 343  
Residential Real Estate          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Total 1 2 3 3  
Consumer          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Total 73 $ 57 159 $ 116  
Revolving Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 33,362   33,362   33,120
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans 44   87    
Revolving Loans Converted to Term Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 1,545   1,545   1,543
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans Converted to Term Loans 1   2    
Residential | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 1,806   1,806   2,277
Year two 1,992   1,992   1,372
Year three 1,302   1,302   4,571
Year four 4,534   4,534   3,628
Year five 3,804   3,804   2,439
Prior 10,557   10,557   8,773
Total 24,117   24,117   23,166
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one 0   0    
Year two 0   0    
Year three 0   0    
Year four 1   1    
Year five 0   0    
Prior 0   2    
Total 1   3    
Residential | Revolving Loans | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 122   122   106
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans 0   0    
Residential | Revolving Loans Converted to Term Loans | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans Converted to Term Loans 0   0    
Home equity lines and loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   2
Year five 1   1   2
Prior 87   87   95
Total 4,634   4,634   4,592
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one 0   0    
Year two 0   0    
Year three 0   0    
Year four 0   0    
Year five 0   0    
Prior 0   0    
Total 1   2    
Home equity lines and loans | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 3,156   3,156   3,085
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans 0   0    
Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 1,390   1,390   1,408
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans Converted to Term Loans 1   2    
Recreational finance | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 2,462   2,462   3,934
Year two 3,482   3,482   2,227
Year three 1,973   1,973   2,065
Year four 1,874   1,874   1,686
Year five 1,511   1,511   1,119
Prior 2,364   2,364   1,533
Total 13,666   13,666   12,564
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one 1   1    
Year two 6   11    
Year three 6   14    
Year four 6   13    
Year five 5   12    
Prior 9   22    
Total 33   73    
Recreational finance | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans 0   0    
Recreational finance | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans Converted to Term Loans 0   0    
Automobile | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 1,120   1,120   2,277
Year two 2,071   2,071   790
Year three 723   723   756
Year four 641   641   646
Year five 502   502   226
Prior 203   203   99
Total 5,260   5,260   4,794
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one 0   0    
Year two 4   7    
Year three 2   5    
Year four 3   6    
Year five 1   3    
Prior 1   2    
Total 11   23    
Automobile | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans 0   0    
Automobile | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans Converted to Term Loans 0   0    
Other | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 208   208   265
Year two 202   202   155
Year three 122   122   104
Year four 76   76   72
Year five 56   56   16
Prior 27   27   18
Total 2,212   2,212   2,220
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one 6   7    
Year two 2   8    
Year three 2   5    
Year four 1   2    
Year five 0   1    
Prior 0   1    
Total 28   61    
Other | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 1,519   1,519   1,588
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans 17   37    
Other | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 2   2   2
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Revolving Loans Converted to Term Loans 0   0    
Current | Residential | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 1,802   1,802   2,264
Year two 1,976   1,976   1,354
Year three 1,273   1,273   4,394
Year four 4,333   4,333   3,488
Year five 3,610   3,610   2,376
Prior 9,681   9,681   7,874
Total 22,796   22,796   21,853
Current | Residential | Revolving Loans | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 121   121   103
Current | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Current | Home equity lines and loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   2
Year five 1   1   2
Prior 84   84   91
Total 4,530   4,530   4,482
Current | Home equity lines and loans | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 3,155   3,155   3,085
Current | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 1,290   1,290   1,302
Current | Recreational finance | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 2,459   2,459   3,918
Year two 3,462   3,462   2,203
Year three 1,953   1,953   2,044
Year four 1,855   1,855   1,661
Year five 1,494   1,494   1,100
Prior 2,332   2,332   1,503
Total 13,555   13,555   12,429
Current | Recreational finance | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
Current | Recreational finance | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Current | Automobile | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 1,116   1,116   2,264
Year two 2,056   2,056   775
Year three 709   709   740
Year four 628   628   632
Year five 493   493   220
Prior 197   197   93
Total 5,199   5,199   4,724
Current | Automobile | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
Current | Automobile | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Current | Other | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 204   204   259
Year two 199   199   152
Year three 119   119   102
Year four 75   75   71
Year five 56   56   16
Prior 27   27   18
Total 2,171   2,171   2,134
Current | Other | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 1,490   1,490   1,515
Current | Other | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 1   1   1
30-89 days past due | Residential | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 4   4   12
Year two 9   9   9
Year three 13   13   111
Year four 100   100   77
Year five 70   70   38
Prior 410   410   472
Total 606   606   719
30-89 days past due | Residential | Revolving Loans | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
30-89 days past due | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
30-89 days past due | Home equity lines and loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 1   1   2
Total 29   29   29
30-89 days past due | Home equity lines and loans | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
30-89 days past due | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 28   28   27
30-89 days past due | Recreational finance | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 2   2   13
Year two 16   16   18
Year three 15   15   15
Year four 15   15   20
Year five 13   13   15
Prior 25   25   23
Total 86   86   104
30-89 days past due | Recreational finance | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
30-89 days past due | Recreational finance | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
30-89 days past due | Automobile | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 3   3   11
Year two 13   13   13
Year three 12   12   13
Year four 11   11   12
Year five 8   8   5
Prior 5   5   4
Total 52   52   58
30-89 days past due | Automobile | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
30-89 days past due | Automobile | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
30-89 days past due | Other | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 2   2   4
Year two 2   2   2
Year three 2   2   1
Year four 1   1   1
Year five 0   0   0
Prior 0   0   0
Total 20   20   23
30-89 days past due | Other | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 12   12   14
30-89 days past due | Other | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 1   1   1
Accruing Loans Past Due 90 Days or More | Residential | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   1
Year two 3   3   7
Year three 10   10   39
Year four 63   63   47
Year five 107   107   20
Prior 267   267   201
Total 450   450   315
Accruing Loans Past Due 90 Days or More | Residential | Revolving Loans | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
Accruing Loans Past Due 90 Days or More | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Accruing Loans Past Due 90 Days or More | Home equity lines and loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Total 0   0   0
Accruing Loans Past Due 90 Days or More | Home equity lines and loans | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
Accruing Loans Past Due 90 Days or More | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Accruing Loans Past Due 90 Days or More | Recreational finance | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Total 0   0   0
Accruing Loans Past Due 90 Days or More | Recreational finance | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
Accruing Loans Past Due 90 Days or More | Recreational finance | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Accruing Loans Past Due 90 Days or More | Automobile | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Total 0   0   0
Accruing Loans Past Due 90 Days or More | Automobile | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
Accruing Loans Past Due 90 Days or More | Automobile | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Accruing Loans Past Due 90 Days or More | Other | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Total 9   9   8
Accruing Loans Past Due 90 Days or More | Other | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 9   9   8
Accruing Loans Past Due 90 Days or More | Other | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Nonaccrual | Residential | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 4   4   2
Year three 6   6   27
Year four 38   38   16
Year five 17   17   5
Prior 199   199   226
Total 265   265   279
Nonaccrual | Residential | Revolving Loans | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 1   1   3
Nonaccrual | Residential | Revolving Loans Converted to Term Loans | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Nonaccrual | Home equity lines and loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 2   2   2
Total 75   75   81
Nonaccrual | Home equity lines and loans | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 1   1   0
Nonaccrual | Home equity lines and loans | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 72   72   79
Nonaccrual | Recreational finance | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 1   1   3
Year two 4   4   6
Year three 5   5   6
Year four 4   4   5
Year five 4   4   4
Prior 7   7   7
Total 25   25   31
Nonaccrual | Recreational finance | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
Nonaccrual | Recreational finance | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Nonaccrual | Automobile | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 1   1   2
Year two 2   2   2
Year three 2   2   3
Year four 2   2   2
Year five 1   1   1
Prior 1   1   2
Total 9   9   12
Nonaccrual | Automobile | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 0   0   0
Nonaccrual | Automobile | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans 0   0   0
Nonaccrual | Other | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 2   2   2
Year two 1   1   1
Year three 1   1   1
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Total 12   12   55
Nonaccrual | Other | Revolving Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans 8   8   51
Nonaccrual | Other | Revolving Loans Converted to Term Loans | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
Revolving Loans Converted to Term Loans $ 0   $ 0   $ 0
[1] Loans of $2.5 billion and $1.5 billion at June 30, 2025 and December 31, 2024, respectively, were held in special purpose trusts to settle the respective obligations of asset-backed notes issued by those trusts. The outstanding balances of those asset-backed notes issued to third party investors were included in Long-term borrowings and were $2.1 billion at June 30, 2025 and $1.2 billion at December 31, 2024.