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Loans and Allowance for Loan Losses - Loans in Consumer Portfolio Segment Based on Refreshed LTV ratios (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Credit quality of consumer loans    
Loans held for investment $ 78,567 $ 82,166
Consumer    
Credit quality of consumer loans    
2020 4,796 4,673
2019 4,007 5,930
2018 3,981 3,164
2017 2,059 5,394
2016 3,756 5,040
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 8,728 6,537
Financing Receivable, Revolving 1,106 1,279
Loans held for investment $ 28,433 $ 32,017
2020 Percentage 17.00% 15.00%
2019 Percentage 14.00% 18.00%
2018 Percentage 14.00% 10.00%
2017 Percentage 7.00% 17.00%
2016 Percentage 13.00% 16.00%
Prior Percentage 31.00% 20.00%
Revolving Percentage 4.00% 4.00%
Total 100.00% 100.00%
Consumer | Residential mortgage and home equity    
Credit quality of consumer loans    
2020 $ 4,006 $ 4,067
2019 3,563 4,291
2018 2,937 2,743
2017 1,854 5,365
2016 3,739 5,037
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 8,702 6,505
Financing Receivable, Revolving $ 880 $ 1,026
2020 Percentage 16.00% 14.00%
2019 Percentage 14.00% 15.00%
2018 Percentage 11.00% 9.00%
2017 Percentage 7.00% 18.00%
2016 Percentage 15.00% 17.00%
Prior Percentage 34.00% 23.00%
Revolving Percentage 3.00% 4.00%
Total 100.00% 100.00%
Consumer | Residential mortgage and home equity | Debt-to-Value Ratio, Less than 80 Percent [Member]    
Credit quality of consumer loans    
2020 $ 3,959 $ 3,924
2019 3,499 4,157
2018 2,910 2,631
2017 1,834 5,339
2016 3,734 5,032
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 8,671 6,455
Financing Receivable, Revolving 862 961
Consumer | Residential mortgage and home equity | Debt-to-Value Ratio, 80 to 100 Percent [Member]    
Credit quality of consumer loans    
2020 46 139
2019 62 133
2018 27 111
2017 20 25
2016 5 4
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 10 23
Financing Receivable, Revolving 13 61
Consumer | Residential mortgage and home equity | Debt-To-Value Ratio, Greater Than 100 Percent [Member]    
Credit quality of consumer loans    
2020 0 0
2019 0 0
2018 0 0
2017 0 0
2016 0 0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1 2
Financing Receivable, Revolving 0 0
Consumer | Residential mortgage and home equity | No LTV Available    
Credit quality of consumer loans    
2020 1 4
2019 2 1
2018 0 1
2017 0 1
2016 0 1
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 20 25
Financing Receivable, Revolving 5 4
Residential mortgage and home equity | Consumer Loans    
Credit quality of consumer loans    
Loans held for investment $ 25,681 $ 29,034