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Loans and Related Allowance for Credit Losses, Loans by Delinquency Status, Consumer (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 911,807 $ 895,394 $ 861,572
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
Loans, 90 days or more past due and still accruing 4,011 5,358  
Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
Loans, 90 days or more past due and still accruing 676 659  
Government insured or guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
Loans, 90 days or more past due and still accruing 3,335 4,699  
Total Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 26,665 101,969  
Term loans by origination year, fiscal year before current fiscal year 97,218 55,214  
Term loans by origination year, two years before current fiscal year 51,577 34,661  
Term loans by origination year, three years before current fiscal year 31,181 11,714  
Term loans by origination year, four years before current fiscal year 10,286 15,842  
Term loans by origination year, more than five years before current fiscal year 83,887 77,309  
Revolving loans 77,106 78,564  
Revolving loans converted to term loans 7,173 7,001  
Loans 385,093 382,274  
Total Consumer [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
Loans, 90 days or more past due and still accruing 409 424  
Total Consumer [Member] | 90 days or more past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,200 2,700  
Residential mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 18,441 70,176  
Term loans by origination year, fiscal year before current fiscal year 68,614 41,794  
Term loans by origination year, two years before current fiscal year 39,789 25,234  
Term loans by origination year, three years before current fiscal year 23,082 8,122  
Term loans by origination year, four years before current fiscal year 7,322 14,245  
Term loans by origination year, more than five years before current fiscal year 82,074 76,380  
Revolving loans 14,509 16,305  
Revolving loans converted to term loans 6,803 6,632  
Loans 260,634 258,888  
Residential mortgage - first lien [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 18,436 70,148  
Term loans by origination year, fiscal year before current fiscal year 68,583 41,774  
Term loans by origination year, two years before current fiscal year 39,770 25,203  
Term loans by origination year, three years before current fiscal year 23,053 8,095  
Term loans by origination year, four years before current fiscal year 7,298 14,223  
Term loans by origination year, more than five years before current fiscal year 81,367 75,618  
Revolving loans 4,728 5,313  
Revolving loans converted to term loans 2,007 1,896  
Loans 245,242 242,270  
Residential mortgage - first lien [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
Loans, 90 days or more past due and still accruing 14 37  
Residential mortgage - first lien [Member] | Government insured or guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 1 14  
Term loans by origination year, fiscal year before current fiscal year 25 134  
Term loans by origination year, two years before current fiscal year 124 209  
Term loans by origination year, three years before current fiscal year 167 349  
Term loans by origination year, four years before current fiscal year 283 364  
Term loans by origination year, more than five years before current fiscal year 9,970 12,088  
Revolving loans 0 0  
Revolving loans converted to term loans 0 0  
Loans 10,570 13,158  
Residential mortgage - first lien [Member] | Current-29 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 18,386 69,994  
Term loans by origination year, fiscal year before current fiscal year 68,443 41,527  
Term loans by origination year, two years before current fiscal year 39,567 24,887  
Term loans by origination year, three years before current fiscal year 22,814 7,660  
Term loans by origination year, four years before current fiscal year 6,951 13,734  
Term loans by origination year, more than five years before current fiscal year 69,780 61,576  
Revolving loans 4,671 5,248  
Revolving loans converted to term loans 1,788 1,673  
Loans 232,400 226,299  
Residential mortgage - first lien [Member] | 30-59 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 49 129  
Term loans by origination year, fiscal year before current fiscal year 97 27  
Term loans by origination year, two years before current fiscal year 20 30  
Term loans by origination year, three years before current fiscal year 31 12  
Term loans by origination year, four years before current fiscal year 12 24  
Term loans by origination year, more than five years before current fiscal year 430 418  
Revolving loans 13 14  
Revolving loans converted to term loans 32 29  
Loans 684 683  
Residential mortgage - first lien [Member] | 60 to 89 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 10  
Term loans by origination year, fiscal year before current fiscal year 13 7  
Term loans by origination year, two years before current fiscal year 5 2  
Term loans by origination year, three years before current fiscal year 1 0  
Term loans by origination year, four years before current fiscal year 5 3  
Term loans by origination year, more than five years before current fiscal year 122 126  
Revolving loans 5 7  
Revolving loans converted to term loans 17 15  
Loans 168 170  
Residential mortgage - first lien [Member] | 90-119 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 3 1  
Term loans by origination year, two years before current fiscal year 2 1  
Term loans by origination year, three years before current fiscal year 0 1  
Term loans by origination year, four years before current fiscal year 6 5  
Term loans by origination year, more than five years before current fiscal year 59 53  
Revolving loans 3 4  
Revolving loans converted to term loans 10 9  
Loans 83 74  
Residential mortgage - first lien [Member] | 120-179 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 1  
Term loans by origination year, fiscal year before current fiscal year 2 16  
Term loans by origination year, two years before current fiscal year 11 2  
Term loans by origination year, three years before current fiscal year 1 2  
Term loans by origination year, four years before current fiscal year 1 1  
Term loans by origination year, more than five years before current fiscal year 77 63  
Revolving loans 6 4  
Revolving loans converted to term loans 13 14  
Loans 111 103  
Residential mortgage - first lien [Member] | 180 plus days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 62  
Term loans by origination year, two years before current fiscal year 41 72  
Term loans by origination year, three years before current fiscal year 39 71  
Term loans by origination year, four years before current fiscal year 40 92  
Term loans by origination year, more than five years before current fiscal year 929 1,294  
Revolving loans 30 36  
Revolving loans converted to term loans 147 156  
Loans 1,226 1,783  
Residential mortgage - first lien [Member] | 90 days or more past due [Member] | Government insured or guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,800 5,700  
Residential mortgage - junior lien [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 5 28  
Term loans by origination year, fiscal year before current fiscal year 31 20  
Term loans by origination year, two years before current fiscal year 19 31  
Term loans by origination year, three years before current fiscal year 29 27  
Term loans by origination year, four years before current fiscal year 24 22  
Term loans by origination year, more than five years before current fiscal year 707 762  
Revolving loans 9,781 10,992  
Revolving loans converted to term loans 4,796 4,736  
Loans 15,392 16,618  
Residential mortgage - junior lien [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
Loans, 90 days or more past due and still accruing 6 12  
Residential mortgage - junior lien [Member] | Current-29 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 5 28  
Term loans by origination year, fiscal year before current fiscal year 31 20  
Term loans by origination year, two years before current fiscal year 19 30  
Term loans by origination year, three years before current fiscal year 28 26  
Term loans by origination year, four years before current fiscal year 24 21  
Term loans by origination year, more than five years before current fiscal year 652 700  
Revolving loans 9,695 10,883  
Revolving loans converted to term loans 4,516 4,426  
Loans 14,970 16,134  
Residential mortgage - junior lien [Member] | 30-59 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 1 0  
Term loans by origination year, four years before current fiscal year 0 1  
Term loans by origination year, more than five years before current fiscal year 10 10  
Revolving loans 18 29  
Revolving loans converted to term loans 38 46  
Loans 67 86  
Residential mortgage - junior lien [Member] | 60 to 89 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 4 4  
Revolving loans 7 10  
Revolving loans converted to term loans 20 21  
Loans 31 35  
Residential mortgage - junior lien [Member] | 90-119 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 1  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 2 3  
Revolving loans 5 4  
Revolving loans converted to term loans 12 12  
Loans 19 20  
Residential mortgage - junior lien [Member] | 120-179 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 4 5  
Revolving loans 5 7  
Revolving loans converted to term loans 17 14  
Loans 26 26  
Residential mortgage - junior lien [Member] | 180 plus days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 1  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 35 40  
Revolving loans 51 59  
Revolving loans converted to term loans 193 217  
Loans 279 317  
Credit card [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 0 0  
Revolving loans 38,417 38,243  
Revolving loans converted to term loans 222 210  
Loans 38,639 38,453  
Credit card [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
Loans, 90 days or more past due and still accruing 294 269  
Credit card [Member] | Current-29 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 0 0  
Revolving loans 37,844 37,686  
Revolving loans converted to term loans 195 192  
Loans 38,039 37,878  
Credit card [Member] | 30-59 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 0 0  
Revolving loans 169 176  
Revolving loans converted to term loans 10 7  
Loans 179 183  
Credit card [Member] | 60 to 89 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 0 0  
Revolving loans 119 118  
Revolving loans converted to term loans 8 5  
Loans 127 123  
Credit card [Member] | 90-119 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 0 0  
Revolving loans 100 98  
Revolving loans converted to term loans 6 5  
Loans 106 103  
Credit card [Member] | 120-179 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 0 0  
Revolving loans 185 165  
Revolving loans converted to term loans 3 1  
Loans 188 166  
Credit card [Member] | 180 plus days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 0 0  
Revolving loans 0 0  
Revolving loans converted to term loans 0 0  
Loans 0 0  
Auto [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 7,239 29,566  
Term loans by origination year, fiscal year before current fiscal year 26,701 12,700  
Term loans by origination year, two years before current fiscal year 11,205 8,717  
Term loans by origination year, three years before current fiscal year 7,518 3,386  
Term loans by origination year, four years before current fiscal year 2,808 1,490  
Term loans by origination year, more than five years before current fiscal year 1,612 800  
Revolving loans 0 0  
Revolving loans converted to term loans 0 0  
Loans 57,083 56,659  
Auto [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
Loans, 90 days or more past due and still accruing 79 88  
Auto [Member] | Current-29 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 7,230 29,246  
Term loans by origination year, fiscal year before current fiscal year 26,314 12,412  
Term loans by origination year, two years before current fiscal year 10,965 8,476  
Term loans by origination year, three years before current fiscal year 7,331 3,271  
Term loans by origination year, four years before current fiscal year 2,721 1,424  
Term loans by origination year, more than five years before current fiscal year 1,511 714  
Revolving loans 0 0  
Revolving loans converted to term loans 0 0  
Loans 56,072 55,543  
Auto [Member] | 30-59 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 9 220  
Term loans by origination year, fiscal year before current fiscal year 251 193  
Term loans by origination year, two years before current fiscal year 158 165  
Term loans by origination year, three years before current fiscal year 125 81  
Term loans by origination year, four years before current fiscal year 60 46  
Term loans by origination year, more than five years before current fiscal year 67 57  
Revolving loans 0 0  
Revolving loans converted to term loans 0 0  
Loans 670 762  
Auto [Member] | 60 to 89 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 69  
Term loans by origination year, fiscal year before current fiscal year 94 67  
Term loans by origination year, two years before current fiscal year 57 53  
Term loans by origination year, three years before current fiscal year 45 25  
Term loans by origination year, four years before current fiscal year 20 14  
Term loans by origination year, more than five years before current fiscal year 25 21  
Revolving loans 0 0  
Revolving loans converted to term loans 0 0  
Loans 241 249  
Auto [Member] | 90-119 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 31  
Term loans by origination year, fiscal year before current fiscal year 41 27  
Term loans by origination year, two years before current fiscal year 24 22  
Term loans by origination year, three years before current fiscal year 17 9  
Term loans by origination year, four years before current fiscal year 7 6  
Term loans by origination year, more than five years before current fiscal year 9 8  
Revolving loans 0 0  
Revolving loans converted to term loans 0 0  
Loans 98 103  
Auto [Member] | 120-179 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 1 1  
Term loans by origination year, two years before current fiscal year 1 1  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 0 0  
Revolving loans 0 0  
Revolving loans converted to term loans 0 0  
Loans 2 2  
Auto [Member] | 180 plus days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 0 0  
Revolving loans 0 0  
Revolving loans converted to term loans 0 0  
Loans 0 0  
Other consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 985 2,227  
Term loans by origination year, fiscal year before current fiscal year 1,903 720  
Term loans by origination year, two years before current fiscal year 583 710  
Term loans by origination year, three years before current fiscal year 581 206  
Term loans by origination year, four years before current fiscal year 156 107  
Term loans by origination year, more than five years before current fiscal year 201 129  
Revolving loans 24,180 24,016  
Revolving loans converted to term loans 148 159  
Loans 28,737 28,274  
Other consumer [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
Loans, 90 days or more past due and still accruing 16 18  
Other consumer [Member] | Current-29 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 985 2,221  
Term loans by origination year, fiscal year before current fiscal year 1,892 716  
Term loans by origination year, two years before current fiscal year 579 703  
Term loans by origination year, three years before current fiscal year 576 203  
Term loans by origination year, four years before current fiscal year 153 107  
Term loans by origination year, more than five years before current fiscal year 198 125  
Revolving loans 24,155 23,988  
Revolving loans converted to term loans 132 143  
Loans 28,670 28,206  
Other consumer [Member] | 30-59 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 3  
Term loans by origination year, fiscal year before current fiscal year 5 2  
Term loans by origination year, two years before current fiscal year 2 3  
Term loans by origination year, three years before current fiscal year 3 1  
Term loans by origination year, four years before current fiscal year 1 0  
Term loans by origination year, more than five years before current fiscal year 1 2  
Revolving loans 10 10  
Revolving loans converted to term loans 3 4  
Loans 25 25  
Other consumer [Member] | 60 to 89 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 2  
Term loans by origination year, fiscal year before current fiscal year 3 1  
Term loans by origination year, two years before current fiscal year 1 2  
Term loans by origination year, three years before current fiscal year 1 1  
Term loans by origination year, four years before current fiscal year 1 0  
Term loans by origination year, more than five years before current fiscal year 1 1  
Revolving loans 4 5  
Revolving loans converted to term loans 1 1  
Loans 12 13  
Other consumer [Member] | 90-119 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 1  
Term loans by origination year, fiscal year before current fiscal year 3 1  
Term loans by origination year, two years before current fiscal year 1 2  
Term loans by origination year, three years before current fiscal year 1 1  
Term loans by origination year, four years before current fiscal year 1 0  
Term loans by origination year, more than five years before current fiscal year 0 0  
Revolving loans 3 4  
Revolving loans converted to term loans 1 0  
Loans 10 9  
Other consumer [Member] | 120-179 days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 0 0  
Revolving loans 7 8  
Revolving loans converted to term loans 3 2  
Loans 10 10  
Other consumer [Member] | 180 plus days past due [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 1 1  
Revolving loans 1 1  
Revolving loans converted to term loans 8 9  
Loans $ 10 $ 11