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Loans and Allowance for Credit Losses, Loans by Loan to Value Ratio, Consumer (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
High value properties, threshold $ 1        
Loans by Loan to Value [Abstract]          
Loans 887,637 $ 962,265 $ 953,110 $ 956,770 $ 967,604
Purchase credit deteriorated [Member]          
Loans by Loan to Value [Abstract]          
Loans   568      
Total Consumer [Member]          
Loans by Loan to Value [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 Loan to Value [Abstract]          
Loans   445,978      
Total Consumer [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   11,170      
Total Consumer [Member] | Purchase credit deteriorated [Member]          
Loans by Loan to Value [Abstract]          
Loans   568      
Total Consumer [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   $ 568      
Total Consumer [Member] | LTV greater than 80% [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, percent of debt-to-value ratio   9.00%      
Residential mortgage [Member]          
Loans by Loan to Value [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 Loan to Value [Abstract]          
Loans   322,788      
Residential mortgage [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   11,170      
Residential mortgage [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   568      
Residential mortgage [Member] | LTV 0-60% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   166,081      
Residential mortgage [Member] | LTV 60.01-80% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   124,458      
Residential mortgage [Member] | LTV 80.01-100% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   17,441      
Residential mortgage [Member] | LTV 100.01-120% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   1,838      
Residential mortgage [Member] | LTV greater than 120% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   674      
Residential mortgage [Member] | No LTV/CLTV available [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   1,126      
Real estate 1-4 family first mortgage [Member]          
Loans by Loan to Value [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 Loan to Value [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 Loan to Value [Abstract]          
Loans   293,292      
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   11,170      
Real estate 1-4 family first mortgage [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   555      
Real estate 1-4 family first mortgage [Member] | LTV 0-60% [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Term loans by origination year, 2020 16,582        
Term loans by origination year, 2019 15,449        
Term loans by origination year, 2018 6,065        
Term loans by origination year, 2017 13,190        
Term loans by origination year, 2016 21,097        
Term loans by origination year, Prior 59,291        
Revolving loans 4,971        
Revolving loans converted to term loans 1,587        
Loans 138,232        
Real estate 1-4 family first mortgage [Member] | LTV 0-60% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   151,478      
Real estate 1-4 family first mortgage [Member] | LTV 60.01-80% [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Term loans by origination year, 2020 34,639        
Term loans by origination year, 2019 24,736        
Term loans by origination year, 2018 7,724        
Term loans by origination year, 2017 10,745        
Term loans by origination year, 2016 8,970        
Term loans by origination year, Prior 9,333        
Revolving loans 1,323        
Revolving loans converted to term loans 326        
Loans 97,796        
Real estate 1-4 family first mortgage [Member] | LTV 60.01-80% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   114,795      
Real estate 1-4 family first mortgage [Member] | LTV 80.01-100% [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Term loans by origination year, 2020 2,332        
Term loans by origination year, 2019 2,975        
Term loans by origination year, 2018 900        
Term loans by origination year, 2017 654        
Term loans by origination year, 2016 441        
Term loans by origination year, Prior 1,003        
Revolving loans 425        
Revolving loans converted to term loans 100        
Loans 8,830        
Real estate 1-4 family first mortgage [Member] | LTV 80.01-100% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   13,867      
Real estate 1-4 family first mortgage [Member] | LTV 100.01-120% [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Term loans by origination year, 2020 41        
Term loans by origination year, 2019 106        
Term loans by origination year, 2018 45        
Term loans by origination year, 2017 40        
Term loans by origination year, 2016 41        
Term loans by origination year, Prior 168        
Revolving loans 117        
Revolving loans converted to term loans 26        
Loans 584        
Real estate 1-4 family first mortgage [Member] | LTV 100.01-120% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   860      
Real estate 1-4 family first mortgage [Member] | LTV greater than 120% [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Term loans by origination year, 2020 31        
Term loans by origination year, 2019 41        
Term loans by origination year, 2018 16        
Term loans by origination year, 2017 19        
Term loans by origination year, 2016 16        
Term loans by origination year, Prior 78        
Revolving loans 44        
Revolving loans converted to term loans 8        
Loans 253        
Real estate 1-4 family first mortgage [Member] | LTV greater than 120% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   338      
Real estate 1-4 family first mortgage [Member] | No LTV/CLTV available [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Term loans by origination year, 2020 110        
Term loans by origination year, 2019 92        
Term loans by origination year, 2018 63        
Term loans by origination year, 2017 72        
Term loans by origination year, 2016 87        
Term loans by origination year, Prior 248        
Revolving loans 54        
Revolving loans converted to term loans 13        
Loans 739        
Real estate 1-4 family first mortgage [Member] | No LTV/CLTV available [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   784      
Real estate 1-4 family junior lien mortgage [Member]          
Loans by Loan to Value [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 Loan to Value [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 Loan to Value [Abstract]          
Loans   0      
Real estate 1-4 family junior lien mortgage [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   13      
Real estate 1-4 family junior lien mortgage [Member] | LTV 0-60% [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [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 548        
Revolving loans 8,626        
Revolving loans converted to term loans 3,742        
Loans 12,916        
Real estate 1-4 family junior lien mortgage [Member] | LTV 0-60% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   14,603      
Real estate 1-4 family junior lien mortgage [Member] | LTV 60.01-80% [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [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 335        
Revolving loans 5,081        
Revolving loans converted to term loans 1,554        
Loans 6,970        
Real estate 1-4 family junior lien mortgage [Member] | LTV 60.01-80% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   9,663      
Real estate 1-4 family junior lien mortgage [Member] | LTV 80.01-100% [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [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 187        
Revolving loans 1,507        
Revolving loans converted to term loans 641        
Loans 2,335        
Real estate 1-4 family junior lien mortgage [Member] | LTV 80.01-100% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   3,574      
Real estate 1-4 family junior lien mortgage [Member] | LTV 100.01-120% [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [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 59        
Revolving loans 376        
Revolving loans converted to term loans 156        
Loans 591        
Real estate 1-4 family junior lien mortgage [Member] | LTV 100.01-120% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   978      
Real estate 1-4 family junior lien mortgage [Member] | LTV greater than 120% [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [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 15        
Revolving loans 128        
Revolving loans converted to term loans 50        
Loans 193        
Real estate 1-4 family junior lien mortgage [Member] | LTV greater than 120% [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   336      
Real estate 1-4 family junior lien mortgage [Member] | No LTV/CLTV available [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [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 45        
Revolving loans 25        
Revolving loans converted to term loans 38        
Loans $ 281        
Real estate 1-4 family junior lien mortgage [Member] | No LTV/CLTV available [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member]          
Loans by Loan to Value [Abstract]          
Loans   $ 342