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LOANS AND LEASES - Schedule of Origination Year (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year $ 4,667.0   $ 4,667.0   $ 5,418.0
Fiscal year before current fiscal year 4,953.0   4,953.0   4,916.0
Two years before current fiscal year 4,496.0   4,496.0   5,924.0
Three years before current fiscal year 5,102.0   5,102.0   5,165.0
Four years before current fiscal year 4,427.0   4,427.0   2,997.0
Prior 7,818.0   7,818.0   6,092.0
Revolving Loans Amortized Cost Basis 3,494.0   3,494.0   3,427.0
Total Loans and Leases 34,957.0 [1] $ 33,717.0 34,957.0 [1] $ 33,717.0 33,939.0 [1]
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Current fiscal year, charge-off     0.3   0.4
Fiscal year before current fiscal year, charge-off     2.2   7.4
Two years before current fiscal year, charge-off     2.1   7.7
Three years before current fiscal year, charge-off     9.0   20.5
Four years before current fiscal year, charge-off     12.0   17.0
Prior, charge-off     38.9   28.8
Revolving Loans Amortized Cost Basis, charge-off     0.0   0.0
Total Loans and Leases, charge-off     64.5   81.8
Current          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 34,730.0   34,730.0   33,658.0
Past due          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 227.0   227.0   281.0
Total commercial loans and leases          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 2,747.0   2,747.0   3,002.0
Fiscal year before current fiscal year 2,654.0   2,654.0   3,089.0
Two years before current fiscal year 2,864.0   2,864.0   3,571.0
Three years before current fiscal year 2,939.0   2,939.0   2,897.0
Four years before current fiscal year 2,363.0   2,363.0   1,874.0
Prior 5,326.0   5,326.0   4,447.0
Revolving Loans Amortized Cost Basis 2,247.0   2,247.0   2,284.0
Total Loans and Leases 21,140.0   21,140.0   21,164.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Total Loans and Leases, charge-off 19.8 25.2 55.2 46.2  
Total commercial loans and leases | Current          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 21,009.0   21,009.0   20,982.0
Total commercial loans and leases | Past due          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 131.0   131.0   182.0
Total commercial loans and leases | Commercial real estate          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 1,012.0   1,012.0   1,408.0
Fiscal year before current fiscal year 1,384.0   1,384.0   1,687.0
Two years before current fiscal year 1,703.0   1,703.0   2,321.0
Three years before current fiscal year 2,106.0   2,106.0   2,079.0
Four years before current fiscal year 1,861.0   1,861.0   1,362.0
Prior 4,281.0   4,281.0   3,611.0
Revolving Loans Amortized Cost Basis 221.0   221.0   237.0
Total Loans and Leases 12,568.0   12,568.0   12,705.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Current fiscal year, charge-off     0.0   0.0
Fiscal year before current fiscal year, charge-off     0.0   0.8
Two years before current fiscal year, charge-off     0.1   1.0
Three years before current fiscal year, charge-off     3.9   15.0
Four years before current fiscal year, charge-off     3.6   10.5
Prior, charge-off     12.2   11.3
Revolving Loans Amortized Cost Basis, charge-off     0.0   0.0
Total Loans and Leases, charge-off 9.2 13.8 19.8 24.1 38.6
Total commercial loans and leases | Commercial real estate | Current          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 12,499.0   12,499.0   12,591.0
Total commercial loans and leases | Commercial real estate | Past due          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 69.0   69.0   114.0
Total commercial loans and leases | Commercial real estate | Pass          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 1,007.0   1,007.0   1,405.0
Fiscal year before current fiscal year 1,362.0   1,362.0   1,661.0
Two years before current fiscal year 1,673.0   1,673.0   2,025.0
Three years before current fiscal year 1,870.0   1,870.0   1,984.0
Four years before current fiscal year 1,706.0   1,706.0   1,200.0
Prior 3,858.0   3,858.0   3,235.0
Revolving Loans Amortized Cost Basis 210.0   210.0   197.0
Total Loans and Leases 11,686.0   11,686.0   11,707.0
Total commercial loans and leases | Commercial real estate | Special Mention          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 5.0   5.0   1.0
Fiscal year before current fiscal year 16.0   16.0   10.0
Two years before current fiscal year 21.0   21.0   177.0
Three years before current fiscal year 179.0   179.0   52.0
Four years before current fiscal year 103.0   103.0   107.0
Prior 206.0   206.0   181.0
Revolving Loans Amortized Cost Basis 3.0   3.0   37.0
Total Loans and Leases 533.0   533.0   565.0
Total commercial loans and leases | Commercial real estate | Substandard          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 0.0   0.0   2.0
Fiscal year before current fiscal year 6.0   6.0   16.0
Two years before current fiscal year 9.0   9.0   119.0
Three years before current fiscal year 57.0   57.0   43.0
Four years before current fiscal year 52.0   52.0   55.0
Prior 217.0   217.0   195.0
Revolving Loans Amortized Cost Basis 8.0   8.0   3.0
Total Loans and Leases 349.0   349.0   433.0
Total commercial loans and leases | Commercial and industrial          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 1,432.0   1,432.0   1,251.0
Fiscal year before current fiscal year 1,069.0   1,069.0   1,149.0
Two years before current fiscal year 938.0   938.0   1,142.0
Three years before current fiscal year 751.0   751.0   754.0
Four years before current fiscal year 454.0   454.0   481.0
Prior 995.0   995.0   791.0
Revolving Loans Amortized Cost Basis 1,951.0   1,951.0   1,982.0
Total Loans and Leases 7,590.0   7,590.0   7,550.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Current fiscal year, charge-off     0.1   0.1
Fiscal year before current fiscal year, charge-off     1.1   3.9
Two years before current fiscal year, charge-off     0.6   1.5
Three years before current fiscal year, charge-off     3.3   1.8
Four years before current fiscal year, charge-off     6.5   6.0
Prior, charge-off     20.0   7.6
Revolving Loans Amortized Cost Basis, charge-off     0.0   0.0
Total Loans and Leases, charge-off 9.2 10.1 31.6 18.7 20.9
Total commercial loans and leases | Commercial and industrial | Current          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 7,536.0   7,536.0   7,488.0
Total commercial loans and leases | Commercial and industrial | Past due          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 54.0   54.0   62.0
Total commercial loans and leases | Commercial and industrial | Pass          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 1,415.0   1,415.0   1,241.0
Fiscal year before current fiscal year 1,048.0   1,048.0   1,079.0
Two years before current fiscal year 871.0   871.0   1,074.0
Three years before current fiscal year 727.0   727.0   647.0
Four years before current fiscal year 411.0   411.0   461.0
Prior 880.0   880.0   669.0
Revolving Loans Amortized Cost Basis 1,760.0   1,760.0   1,861.0
Total Loans and Leases 7,112.0   7,112.0   7,032.0
Total commercial loans and leases | Commercial and industrial | Special Mention          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 14.0   14.0   6.0
Fiscal year before current fiscal year 9.0   9.0   20.0
Two years before current fiscal year 19.0   19.0   57.0
Three years before current fiscal year 14.0   14.0   74.0
Four years before current fiscal year 33.0   33.0   12.0
Prior 75.0   75.0   63.0
Revolving Loans Amortized Cost Basis 92.0   92.0   41.0
Total Loans and Leases 256.0   256.0   273.0
Total commercial loans and leases | Commercial and industrial | Substandard          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 3.0   3.0   4.0
Fiscal year before current fiscal year 12.0   12.0   50.0
Two years before current fiscal year 48.0   48.0   11.0
Three years before current fiscal year 10.0   10.0   33.0
Four years before current fiscal year 10.0   10.0   8.0
Prior 40.0   40.0   59.0
Revolving Loans Amortized Cost Basis 99.0   99.0   80.0
Total Loans and Leases 222.0   222.0   245.0
Total commercial loans and leases | Commercial leases          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 294.0   294.0   331.0
Fiscal year before current fiscal year 201.0   201.0   191.0
Two years before current fiscal year 158.0   158.0   108.0
Three years before current fiscal year 82.0   82.0   64.0
Four years before current fiscal year 48.0   48.0   31.0
Prior 46.0   46.0   40.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 829.0   829.0   765.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Current fiscal year, charge-off     0.0   0.0
Fiscal year before current fiscal year, charge-off     0.0   0.0
Two years before current fiscal year, charge-off     0.0   0.0
Three years before current fiscal year, charge-off     0.0   0.0
Four years before current fiscal year, charge-off     0.0   0.0
Prior, charge-off     0.2   0.3
Revolving Loans Amortized Cost Basis, charge-off     0.0   0.0
Total Loans and Leases, charge-off 0.0 0.1 0.2 0.3 0.3
Total commercial loans and leases | Commercial leases | Current          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 824.0   824.0   762.0
Total commercial loans and leases | Commercial leases | Past due          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 5.0   5.0   3.0
Total commercial loans and leases | Commercial leases | Pass          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 293.0   293.0   331.0
Fiscal year before current fiscal year 197.0   197.0   184.0
Two years before current fiscal year 148.0   148.0   106.0
Three years before current fiscal year 80.0   80.0   60.0
Four years before current fiscal year 45.0   45.0   26.0
Prior 42.0   42.0   39.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 805.0   805.0   746.0
Total commercial loans and leases | Commercial leases | Special Mention          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 1.0   1.0   0.0
Fiscal year before current fiscal year 4.0   4.0   1.0
Two years before current fiscal year 5.0   5.0   0.0
Three years before current fiscal year 1.0   1.0   0.0
Four years before current fiscal year 1.0   1.0   0.0
Prior 4.0   4.0   1.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 16.0   16.0   2.0
Total commercial loans and leases | Commercial leases | Substandard          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 0.0   0.0   0.0
Fiscal year before current fiscal year 0.0   0.0   6.0
Two years before current fiscal year 5.0   5.0   2.0
Three years before current fiscal year 1.0   1.0   4.0
Four years before current fiscal year 2.0   2.0   5.0
Prior 0.0   0.0   0.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 8.0   8.0   17.0
Total commercial loans and leases | Other          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 9.0   9.0   12.0
Fiscal year before current fiscal year 0.0   0.0   62.0
Two years before current fiscal year 65.0   65.0   0.0
Three years before current fiscal year 0.0   0.0   0.0
Four years before current fiscal year 0.0   0.0   0.0
Prior 4.0   4.0   5.0
Revolving Loans Amortized Cost Basis 75.0   75.0   65.0
Total Loans and Leases 153.0   153.0   144.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Current fiscal year, charge-off     0.0   0.0
Fiscal year before current fiscal year, charge-off     0.0   0.0
Two years before current fiscal year, charge-off     0.0   0.0
Three years before current fiscal year, charge-off     0.0   0.0
Four years before current fiscal year, charge-off     0.0   0.0
Prior, charge-off     3.6   4.2
Revolving Loans Amortized Cost Basis, charge-off     0.0   0.0
Total Loans and Leases, charge-off 1.4 1.2 3.6 3.1 4.2
Total commercial loans and leases | Other | Current          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 150.0   150.0   141.0
Total commercial loans and leases | Other | Past due          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 3.0   3.0   3.0
Total commercial loans and leases | Other | Pass          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 9.0   9.0   12.0
Fiscal year before current fiscal year 0.0   0.0   62.0
Two years before current fiscal year 65.0   65.0   0.0
Three years before current fiscal year 0.0   0.0   0.0
Four years before current fiscal year 0.0   0.0   0.0
Prior 4.0   4.0   5.0
Revolving Loans Amortized Cost Basis 75.0   75.0   65.0
Total Loans and Leases 153.0   153.0   144.0
Total consumer loans          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 1,920.0   1,920.0   2,416.0
Fiscal year before current fiscal year 2,299.0   2,299.0   1,827.0
Two years before current fiscal year 1,632.0   1,632.0   2,353.0
Three years before current fiscal year 2,163.0   2,163.0   2,268.0
Four years before current fiscal year 2,064.0   2,064.0   1,123.0
Prior 2,492.0   2,492.0   1,645.0
Revolving Loans Amortized Cost Basis 1,247.0   1,247.0   1,143.0
Total Loans and Leases 13,817.0   13,817.0   12,775.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Total Loans and Leases, charge-off 2.4 4.9 9.3 11.7  
Total consumer loans | Current          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 13,721.0   13,721.0   12,676.0
Total consumer loans | Past due          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Total Loans and Leases 96.0   96.0   99.0
Total consumer loans | Direct installment          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 336.0   336.0   346.0
Fiscal year before current fiscal year 293.0   293.0   278.0
Two years before current fiscal year 233.0   233.0   624.0
Three years before current fiscal year 559.0   559.0   684.0
Four years before current fiscal year 616.0   616.0   342.0
Prior 641.0   641.0   402.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 2,678.0   2,678.0   2,676.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Current fiscal year, charge-off     0.0   0.0
Fiscal year before current fiscal year, charge-off     0.1   0.2
Two years before current fiscal year, charge-off     0.2   0.3
Three years before current fiscal year, charge-off     0.1   0.2
Four years before current fiscal year, charge-off     0.0   0.0
Prior, charge-off     0.3   1.1
Revolving Loans Amortized Cost Basis, charge-off     0.0   0.0
Total Loans and Leases, charge-off 0.1 0.2 0.7 0.8 1.8
Total consumer loans | Direct installment | Current          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 336.0   336.0   346.0
Fiscal year before current fiscal year 292.0   292.0   277.0
Two years before current fiscal year 231.0   231.0   621.0
Three years before current fiscal year 558.0   558.0   683.0
Four years before current fiscal year 615.0   615.0   341.0
Prior 635.0   635.0   396.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 2,667.0   2,667.0   2,664.0
Total consumer loans | Direct installment | Past due          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 0.0   0.0   0.0
Fiscal year before current fiscal year 1.0   1.0   1.0
Two years before current fiscal year 2.0   2.0   3.0
Three years before current fiscal year 1.0   1.0   1.0
Four years before current fiscal year 1.0   1.0   1.0
Prior 6.0   6.0   6.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 11.0   11.0   12.0
Total consumer loans | Residential mortgages          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 1,329.0   1,329.0   1,665.0
Fiscal year before current fiscal year 1,697.0   1,697.0   1,493.0
Two years before current fiscal year 1,357.0   1,357.0   1,604.0
Three years before current fiscal year 1,507.0   1,507.0   1,422.0
Four years before current fiscal year 1,347.0   1,347.0   729.0
Prior 1,651.0   1,651.0   1,073.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 8,888.0   8,888.0   7,986.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Current fiscal year, charge-off     0.0   0.1
Fiscal year before current fiscal year, charge-off     0.3   0.6
Two years before current fiscal year, charge-off     0.5   0.3
Three years before current fiscal year, charge-off     0.1   0.2
Four years before current fiscal year, charge-off     0.2   0.0
Prior, charge-off     1.2   1.4
Revolving Loans Amortized Cost Basis, charge-off     0.0   0.0
Total Loans and Leases, charge-off 0.5 0.1 2.3 0.3 2.6
Total consumer loans | Residential mortgages | Current          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 1,327.0   1,327.0   1,663.0
Fiscal year before current fiscal year 1,687.0   1,687.0   1,478.0
Two years before current fiscal year 1,346.0   1,346.0   1,598.0
Three years before current fiscal year 1,502.0   1,502.0   1,417.0
Four years before current fiscal year 1,342.0   1,342.0   728.0
Prior 1,626.0   1,626.0   1,048.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 8,830.0   8,830.0   7,932.0
Total consumer loans | Residential mortgages | Past due          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 2.0   2.0   2.0
Fiscal year before current fiscal year 10.0   10.0   15.0
Two years before current fiscal year 11.0   11.0   6.0
Three years before current fiscal year 5.0   5.0   5.0
Four years before current fiscal year 5.0   5.0   1.0
Prior 25.0   25.0   25.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 58.0   58.0   54.0
Total consumer loans | Indirect installment          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 251.0   251.0   397.0
Fiscal year before current fiscal year 303.0   303.0   27.0
Two years before current fiscal year 20.0   20.0   73.0
Three years before current fiscal year 53.0   53.0   148.0
Four years before current fiscal year 88.0   88.0   51.0
Prior 52.0   52.0   43.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 767.0   767.0   739.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Current fiscal year, charge-off     0.2   0.2
Fiscal year before current fiscal year, charge-off     0.6   1.8
Two years before current fiscal year, charge-off     0.7   4.5
Three years before current fiscal year, charge-off     1.6   3.2
Four years before current fiscal year, charge-off     1.7   0.5
Prior, charge-off     0.7   1.6
Revolving Loans Amortized Cost Basis, charge-off     0.0   0.0
Total Loans and Leases, charge-off 1.6 4.2 5.5 9.6 11.8
Total consumer loans | Indirect installment | Current          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 251.0   251.0   396.0
Fiscal year before current fiscal year 301.0   301.0   24.0
Two years before current fiscal year 18.0   18.0   67.0
Three years before current fiscal year 48.0   48.0   142.0
Four years before current fiscal year 84.0   84.0   49.0
Prior 51.0   51.0   42.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 753.0   753.0   720.0
Total consumer loans | Indirect installment | Past due          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 0.0   0.0   1.0
Fiscal year before current fiscal year 2.0   2.0   3.0
Two years before current fiscal year 2.0   2.0   6.0
Three years before current fiscal year 5.0   5.0   6.0
Four years before current fiscal year 4.0   4.0   2.0
Prior 1.0   1.0   1.0
Revolving Loans Amortized Cost Basis 0.0   0.0   0.0
Total Loans and Leases 14.0   14.0   19.0
Total consumer loans | Consumer lines of credit          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 4.0   4.0   8.0
Fiscal year before current fiscal year 6.0   6.0   29.0
Two years before current fiscal year 22.0   22.0   52.0
Three years before current fiscal year 44.0   44.0   14.0
Four years before current fiscal year 13.0   13.0   1.0
Prior 148.0   148.0   127.0
Revolving Loans Amortized Cost Basis 1,247.0   1,247.0   1,143.0
Total Loans and Leases 1,484.0   1,484.0   1,374.0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Current fiscal year, charge-off     0.0   0.0
Fiscal year before current fiscal year, charge-off     0.1   0.1
Two years before current fiscal year, charge-off     0.0   0.1
Three years before current fiscal year, charge-off     0.0   0.1
Four years before current fiscal year, charge-off     0.0   0.0
Prior, charge-off     0.7   1.3
Revolving Loans Amortized Cost Basis, charge-off     0.0   0.0
Total Loans and Leases, charge-off 0.2 $ 0.4 0.8 $ 1.0 1.6
Total consumer loans | Consumer lines of credit | Current          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 4.0   4.0   8.0
Fiscal year before current fiscal year 6.0   6.0   29.0
Two years before current fiscal year 22.0   22.0   51.0
Three years before current fiscal year 43.0   43.0   13.0
Four years before current fiscal year 12.0   12.0   1.0
Prior 139.0   139.0   117.0
Revolving Loans Amortized Cost Basis 1,245.0   1,245.0   1,141.0
Total Loans and Leases 1,471.0   1,471.0   1,360.0
Total consumer loans | Consumer lines of credit | Past due          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Current fiscal year 0.0   0.0   0.0
Fiscal year before current fiscal year 0.0   0.0   0.0
Two years before current fiscal year 0.0   0.0   1.0
Three years before current fiscal year 1.0   1.0   1.0
Four years before current fiscal year 1.0   1.0   0.0
Prior 9.0   9.0   10.0
Revolving Loans Amortized Cost Basis 2.0   2.0   2.0
Total Loans and Leases $ 13.0   $ 13.0   $ 14.0
[1] Amount represents loans for which we have elected the fair value option. See Note 18.