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Loans and Allowance for Credit Losses, Loans by FICO Score, Consumer (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans by FICO [Abstract]          
Loans $ 887,637 $ 962,265 $ 953,110 $ 956,770 $ 967,604
Purchase credit deteriorated [Member]          
Loans by FICO [Abstract]          
Loans   568      
Total Consumer [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 75,172        
Term loans by origination year, 2019 60,307        
Term loans by origination year, 2018 22,816        
Term loans by origination year, 2017 29,673        
Term loans by origination year, 2016 35,869        
Term loans by origination year, Prior 97,314        
Revolving loans 79,347        
Revolving loans converted to term loans 8,722        
Loans 409,220 446,546 439,705 453,382 461,068
Total Consumer [Member] | Not purchased credit deteriorated [Member]          
Loans by FICO [Abstract]          
Loans   445,978      
Total Consumer [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   11,170      
Total Consumer [Member] | Purchase credit deteriorated [Member]          
Loans by FICO [Abstract]          
Loans   568      
Total Consumer [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   568      
Total Consumer [Member] | FICO 800 or more [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   196,833      
Total Consumer [Member] | FICO 760-799 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   85,229      
Total Consumer [Member] | FICO 720-759 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   52,598      
Total Consumer [Member] | FICO 680-719 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   36,851      
Total Consumer [Member] | FICO 640-679 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   21,247      
Total Consumer [Member] | FICO 600-639 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   10,927      
Total Consumer [Member] | FICO less than 600 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   14,546      
Total Consumer [Member] | No FICO available [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   $ 7,502      
Total Consumer [Member] | No FICO available [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Financing receivable, percent of FICO score   19.00%      
Total Consumer [Member] | FICO not required [Member]          
Loans by FICO [Abstract]          
Loans 13,200 $ 9,100      
Total Consumer [Member] | FICO not required [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   $ 9,075      
Total Consumer [Member] | FICO less than 680 [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]          
Financing receivable, percent of FICO score   41.00%      
Residential mortgage [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 53,972        
Term loans by origination year, 2019 44,077        
Term loans by origination year, 2018 15,758        
Term loans by origination year, 2017 25,835        
Term loans by origination year, 2016 33,051        
Term loans by origination year, Prior 96,349        
Revolving loans 22,677        
Revolving loans converted to term loans 8,241        
Loans 299,960 $ 323,356      
Residential mortgage [Member] | Not purchased credit deteriorated [Member]          
Loans by FICO [Abstract]          
Loans   322,788      
Residential mortgage [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   11,170      
Residential mortgage [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   568      
Real estate 1-4 family first mortgage [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 53,950        
Term loans by origination year, 2019 44,038        
Term loans by origination year, 2018 15,717        
Term loans by origination year, 2017 25,796        
Term loans by origination year, 2016 33,019        
Term loans by origination year, Prior 95,160        
Revolving loans 6,934        
Revolving loans converted to term loans 2,060        
Loans 276,674 293,847 285,065 284,054 275,579
Real estate 1-4 family first mortgage [Member] | Government insured or guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 215        
Term loans by origination year, 2019 639        
Term loans by origination year, 2018 904        
Term loans by origination year, 2017 1,076        
Term loans by origination year, 2016 2,367        
Term loans by origination year, Prior 25,039        
Revolving loans 0        
Revolving loans converted to term loans 0        
Loans 30,240        
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member]          
Loans by FICO [Abstract]          
Loans   293,292      
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   11,170      
Real estate 1-4 family first mortgage [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   555      
Real estate 1-4 family first mortgage [Member] | FICO 800 or more [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 29,365        
Term loans by origination year, 2019 28,652        
Term loans by origination year, 2018 9,911        
Term loans by origination year, 2017 17,416        
Term loans by origination year, 2016 22,215        
Term loans by origination year, Prior 40,440        
Revolving loans 3,391        
Revolving loans converted to term loans 493        
Loans 151,883        
Real estate 1-4 family first mortgage [Member] | FICO 800 or more [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   165,460      
Real estate 1-4 family first mortgage [Member] | FICO 760-799 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 17,154        
Term loans by origination year, 2019 9,866        
Term loans by origination year, 2018 2,908        
Term loans by origination year, 2017 4,380        
Term loans by origination year, 2016 4,955        
Term loans by origination year, Prior 10,843        
Revolving loans 1,361        
Revolving loans converted to term loans 274        
Loans 51,741        
Real estate 1-4 family first mortgage [Member] | FICO 760-799 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   61,559      
Real estate 1-4 family first mortgage [Member] | FICO 720-759 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 5,274        
Term loans by origination year, 2019 3,290        
Term loans by origination year, 2018 1,189        
Term loans by origination year, 2017 1,829        
Term loans by origination year, 2016 2,106        
Term loans by origination year, Prior 7,001        
Revolving loans 879        
Revolving loans converted to term loans 265        
Loans 21,833        
Real estate 1-4 family first mortgage [Member] | FICO 720-759 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   27,879      
Real estate 1-4 family first mortgage [Member] | FICO 680-719 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 1,361        
Term loans by origination year, 2019 1,084        
Term loans by origination year, 2018 490        
Term loans by origination year, 2017 678        
Term loans by origination year, 2016 831        
Term loans by origination year, Prior 4,403        
Revolving loans 520        
Revolving loans converted to term loans 221        
Loans 9,588        
Real estate 1-4 family first mortgage [Member] | FICO 680-719 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   12,844      
Real estate 1-4 family first mortgage [Member] | FICO 640-679 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 376        
Term loans by origination year, 2019 287        
Term loans by origination year, 2018 148        
Term loans by origination year, 2017 192        
Term loans by origination year, 2016 226        
Term loans by origination year, Prior 2,385        
Revolving loans 241        
Revolving loans converted to term loans 154        
Loans 4,009        
Real estate 1-4 family first mortgage [Member] | FICO 640-679 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   5,068      
Real estate 1-4 family first mortgage [Member] | FICO 600-639 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 55        
Term loans by origination year, 2019 56        
Term loans by origination year, 2018 44        
Term loans by origination year, 2017 56        
Term loans by origination year, 2016 92        
Term loans by origination year, Prior 1,429        
Revolving loans 127        
Revolving loans converted to term loans 106        
Loans 1,965        
Real estate 1-4 family first mortgage [Member] | FICO 600-639 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   2,392      
Real estate 1-4 family first mortgage [Member] | FICO less than 600 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 14        
Term loans by origination year, 2019 29        
Term loans by origination year, 2018 36        
Term loans by origination year, 2017 44        
Term loans by origination year, 2016 66        
Term loans by origination year, Prior 1,789        
Revolving loans 162        
Revolving loans converted to term loans 175        
Loans 2,315        
Real estate 1-4 family first mortgage [Member] | FICO less than 600 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   3,264      
Real estate 1-4 family first mortgage [Member] | No FICO available [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 136        
Term loans by origination year, 2019 135        
Term loans by origination year, 2018 87        
Term loans by origination year, 2017 125        
Term loans by origination year, 2016 161        
Term loans by origination year, Prior 1,831        
Revolving loans 253        
Revolving loans converted to term loans 372        
Loans 3,100        
Real estate 1-4 family first mortgage [Member] | No FICO available [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   3,656      
Real estate 1-4 family first mortgage [Member] | FICO not required [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   0      
Real estate 1-4 family junior lien mortgage [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 22        
Term loans by origination year, 2019 39        
Term loans by origination year, 2018 41        
Term loans by origination year, 2017 39        
Term loans by origination year, 2016 32        
Term loans by origination year, Prior 1,189        
Revolving loans 15,743        
Revolving loans converted to term loans 6,181        
Loans 23,286 29,509 34,398 39,713 46,237
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member]          
Loans by FICO [Abstract]          
Loans   29,496      
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   0      
Real estate 1-4 family junior lien mortgage [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   13      
Real estate 1-4 family junior lien mortgage [Member] | FICO 800 or more [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 293        
Revolving loans 7,973        
Revolving loans converted to term loans 1,819        
Loans 10,085        
Real estate 1-4 family junior lien mortgage [Member] | FICO 800 or more [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   11,851      
Real estate 1-4 family junior lien mortgage [Member] | FICO 760-799 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 177        
Revolving loans 3,005        
Revolving loans converted to term loans 1,032        
Loans 4,214        
Real estate 1-4 family junior lien mortgage [Member] | FICO 760-799 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   5,483      
Real estate 1-4 family junior lien mortgage [Member] | FICO 720-759 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 207        
Revolving loans 2,093        
Revolving loans converted to term loans 1,034        
Loans 3,334        
Real estate 1-4 family junior lien mortgage [Member] | FICO 720-759 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   4,407      
Real estate 1-4 family junior lien mortgage [Member] | FICO 680-719 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 183        
Revolving loans 1,233        
Revolving loans converted to term loans 854        
Loans 2,270        
Real estate 1-4 family junior lien mortgage [Member] | FICO 680-719 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   3,192      
Real estate 1-4 family junior lien mortgage [Member] | FICO 640-679 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 103        
Revolving loans 503        
Revolving loans converted to term loans 493        
Loans 1,099        
Real estate 1-4 family junior lien mortgage [Member] | FICO 640-679 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   1,499      
Real estate 1-4 family junior lien mortgage [Member] | FICO 600-639 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 67        
Revolving loans 241        
Revolving loans converted to term loans 299        
Loans 607        
Real estate 1-4 family junior lien mortgage [Member] | FICO 600-639 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   782      
Real estate 1-4 family junior lien mortgage [Member] | FICO less than 600 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 76        
Revolving loans 254        
Revolving loans converted to term loans 374        
Loans 704        
Real estate 1-4 family junior lien mortgage [Member] | FICO less than 600 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   1,164      
Real estate 1-4 family junior lien mortgage [Member] | No FICO available [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 22        
Term loans by origination year, 2019 39        
Term loans by origination year, 2018 41        
Term loans by origination year, 2017 39        
Term loans by origination year, 2016 32        
Term loans by origination year, Prior 83        
Revolving loans 441        
Revolving loans converted to term loans 276        
Loans 973        
Real estate 1-4 family junior lien mortgage [Member] | No FICO available [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   1,118      
Real estate 1-4 family junior lien mortgage [Member] | FICO not required [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   0      
Credit card [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 0        
Revolving loans 36,374        
Revolving loans converted to term loans 290        
Loans 36,664 41,013 39,025 37,976 36,700
Credit card [Member] | Not purchased credit deteriorated [Member]          
Loans by FICO [Abstract]          
Loans   41,013      
Credit card [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   0      
Credit card [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   0      
Credit card [Member] | FICO 800 or more [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 0        
Revolving loans 3,860        
Revolving loans converted to term loans 1        
Loans 3,861        
Credit card [Member] | FICO 800 or more [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   4,037      
Credit card [Member] | FICO 760-799 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 0        
Revolving loans 5,438        
Revolving loans converted to term loans 7        
Loans 5,445        
Credit card [Member] | FICO 760-799 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   5,648      
Credit card [Member] | FICO 720-759 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 0        
Revolving loans 7,897        
Revolving loans converted to term loans 29        
Loans 7,926        
Credit card [Member] | FICO 720-759 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   8,376      
Credit card [Member] | FICO 680-719 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 0        
Revolving loans 8,854        
Revolving loans converted to term loans 60        
Loans 8,914        
Credit card [Member] | FICO 680-719 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   9,732      
Credit card [Member] | FICO 640-679 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 0        
Revolving loans 5,657        
Revolving loans converted to term loans 64        
Loans 5,721        
Credit card [Member] | FICO 640-679 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   6,626      
Credit card [Member] | FICO 600-639 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 0        
Revolving loans 2,242        
Revolving loans converted to term loans 46        
Loans 2,288        
Credit card [Member] | FICO 600-639 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   2,853      
Credit card [Member] | FICO less than 600 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 0        
Revolving loans 2,416        
Revolving loans converted to term loans 82        
Loans 2,498        
Credit card [Member] | FICO less than 600 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   3,373      
Credit card [Member] | No FICO available [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 0        
Revolving loans 10        
Revolving loans converted to term loans 1        
Loans 11        
Credit card [Member] | No FICO available [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   368      
Credit card [Member] | FICO not required [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   0      
Auto Loan [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 19,790        
Term loans by origination year, 2019 14,831        
Term loans by origination year, 2018 6,471        
Term loans by origination year, 2017 3,573        
Term loans by origination year, 2016 2,757        
Term loans by origination year, Prior 765        
Revolving loans 0        
Revolving loans converted to term loans 0        
Loans 48,187 47,873 45,069 53,371 62,286
Auto Loan [Member] | Not purchased credit deteriorated [Member]          
Loans by FICO [Abstract]          
Loans   47,873      
Auto Loan [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   0      
Auto Loan [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   0      
Auto Loan [Member] | FICO 800 or more [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 2,875        
Term loans by origination year, 2019 2,606        
Term loans by origination year, 2018 1,211        
Term loans by origination year, 2017 731        
Term loans by origination year, 2016 452        
Term loans by origination year, Prior 104        
Revolving loans 0        
Revolving loans converted to term loans 0        
Loans 7,979        
Auto Loan [Member] | FICO 800 or more [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   7,900      
Auto Loan [Member] | FICO 760-799 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 3,036        
Term loans by origination year, 2019 2,662        
Term loans by origination year, 2018 1,122        
Term loans by origination year, 2017 579        
Term loans by origination year, 2016 349        
Term loans by origination year, Prior 81        
Revolving loans 0        
Revolving loans converted to term loans 0        
Loans 7,829        
Auto Loan [Member] | FICO 760-799 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   7,624      
Auto Loan [Member] | FICO 720-759 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 3,162        
Term loans by origination year, 2019 2,514        
Term loans by origination year, 2018 1,095        
Term loans by origination year, 2017 576        
Term loans by origination year, 2016 395        
Term loans by origination year, Prior 98        
Revolving loans 0        
Revolving loans converted to term loans 0        
Loans 7,840        
Auto Loan [Member] | FICO 720-759 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   7,839      
Auto Loan [Member] | FICO 680-719 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 3,534        
Term loans by origination year, 2019 2,542        
Term loans by origination year, 2018 1,066        
Term loans by origination year, 2017 545        
Term loans by origination year, 2016 400        
Term loans by origination year, Prior 105        
Revolving loans 0        
Revolving loans converted to term loans 0        
Loans 8,192        
Auto Loan [Member] | FICO 680-719 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   7,871      
Auto Loan [Member] | FICO 640-679 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 3,381        
Term loans by origination year, 2019 1,948        
Term loans by origination year, 2018 763        
Term loans by origination year, 2017 395        
Term loans by origination year, 2016 334        
Term loans by origination year, Prior 94        
Revolving loans 0        
Revolving loans converted to term loans 0        
Loans 6,915        
Auto Loan [Member] | FICO 640-679 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   6,324      
Auto Loan [Member] | FICO 600-639 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 2,208        
Term loans by origination year, 2019 1,165        
Term loans by origination year, 2018 479        
Term loans by origination year, 2017 274        
Term loans by origination year, 2016 276        
Term loans by origination year, Prior 87        
Revolving loans 0        
Revolving loans converted to term loans 0        
Loans 4,489        
Auto Loan [Member] | FICO 600-639 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   4,230      
Auto Loan [Member] | FICO less than 600 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 1,581        
Term loans by origination year, 2019 1,357        
Term loans by origination year, 2018 730        
Term loans by origination year, 2017 463        
Term loans by origination year, 2016 533        
Term loans by origination year, Prior 186        
Revolving loans 0        
Revolving loans converted to term loans 0        
Loans 4,850        
Auto Loan [Member] | FICO less than 600 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   6,041      
Auto Loan [Member] | No FICO available [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 13        
Term loans by origination year, 2019 37        
Term loans by origination year, 2018 5        
Term loans by origination year, 2017 10        
Term loans by origination year, 2016 18        
Term loans by origination year, Prior 10        
Revolving loans 0        
Revolving loans converted to term loans 0        
Loans 93        
Auto Loan [Member] | No FICO available [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   44      
Auto Loan [Member] | FICO not required [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   0      
Other revolving credit and installment [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 1,410        
Term loans by origination year, 2019 1,399        
Term loans by origination year, 2018 587        
Term loans by origination year, 2017 265        
Term loans by origination year, 2016 61        
Term loans by origination year, Prior 200        
Revolving loans 20,296        
Revolving loans converted to term loans 191        
Loans 24,409 34,304 $ 36,148 $ 38,268 $ 40,266
Other revolving credit and installment [Member] | Not purchased credit deteriorated [Member]          
Loans by FICO [Abstract]          
Loans   34,304      
Other revolving credit and installment [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   0      
Other revolving credit and installment [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   0      
Other revolving credit and installment [Member] | FICO 800 or more [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 353        
Term loans by origination year, 2019 287        
Term loans by origination year, 2018 94        
Term loans by origination year, 2017 35        
Term loans by origination year, 2016 10        
Term loans by origination year, Prior 71        
Revolving loans 2,249        
Revolving loans converted to term loans 21        
Loans 3,120        
Other revolving credit and installment [Member] | FICO 800 or more [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   7,585      
Other revolving credit and installment [Member] | FICO 760-799 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 342        
Term loans by origination year, 2019 279        
Term loans by origination year, 2018 93        
Term loans by origination year, 2017 29        
Term loans by origination year, 2016 10        
Term loans by origination year, Prior 34        
Revolving loans 1,110        
Revolving loans converted to term loans 16        
Loans 1,913        
Other revolving credit and installment [Member] | FICO 760-799 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   4,915      
Other revolving credit and installment [Member] | FICO 720-759 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 262        
Term loans by origination year, 2019 258        
Term loans by origination year, 2018 107        
Term loans by origination year, 2017 35        
Term loans by origination year, 2016 11        
Term loans by origination year, Prior 30        
Revolving loans 915        
Revolving loans converted to term loans 26        
Loans 1,644        
Other revolving credit and installment [Member] | FICO 720-759 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   4,097      
Other revolving credit and installment [Member] | FICO 680-719 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 156        
Term loans by origination year, 2019 213        
Term loans by origination year, 2018 99        
Term loans by origination year, 2017 36        
Term loans by origination year, 2016 11        
Term loans by origination year, Prior 24        
Revolving loans 798        
Revolving loans converted to term loans 31        
Loans 1,368        
Other revolving credit and installment [Member] | FICO 680-719 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   3,212      
Other revolving credit and installment [Member] | FICO 640-679 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 71        
Term loans by origination year, 2019 112        
Term loans by origination year, 2018 59        
Term loans by origination year, 2017 21        
Term loans by origination year, 2016 7        
Term loans by origination year, Prior 10        
Revolving loans 415        
Revolving loans converted to term loans 23        
Loans 718        
Other revolving credit and installment [Member] | FICO 640-679 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   1,730      
Other revolving credit and installment [Member] | FICO 600-639 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 18        
Term loans by origination year, 2019 36        
Term loans by origination year, 2018 22        
Term loans by origination year, 2017 9        
Term loans by origination year, 2016 4        
Term loans by origination year, Prior 8        
Revolving loans 151        
Revolving loans converted to term loans 13        
Loans 261        
Other revolving credit and installment [Member] | FICO 600-639 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   670      
Other revolving credit and installment [Member] | FICO less than 600 [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 13        
Term loans by origination year, 2019 41        
Term loans by origination year, 2018 30        
Term loans by origination year, 2017 12        
Term loans by origination year, 2016 5        
Term loans by origination year, Prior 7        
Revolving loans 161        
Revolving loans converted to term loans 18        
Loans 287        
Other revolving credit and installment [Member] | FICO less than 600 [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   704      
Other revolving credit and installment [Member] | No FICO available [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 195        
Term loans by origination year, 2019 173        
Term loans by origination year, 2018 83        
Term loans by origination year, 2017 88        
Term loans by origination year, 2016 3        
Term loans by origination year, Prior 16        
Revolving loans 1,248        
Revolving loans converted to term loans 43        
Loans 1,849        
Other revolving credit and installment [Member] | No FICO available [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   2,316      
Other revolving credit and installment [Member] | FICO not required [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Term loans by origination year, 2020 0        
Term loans by origination year, 2019 0        
Term loans by origination year, 2018 0        
Term loans by origination year, 2017 0        
Term loans by origination year, 2016 0        
Term loans by origination year, Prior 0        
Revolving loans 13,249        
Revolving loans converted to term loans 0        
Loans $ 13,249        
Other revolving credit and installment [Member] | FICO not required [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by FICO [Abstract]          
Loans   $ 9,075