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Loans and Allowance for Loan Losses - Loans in Consumer Portfolio Segment Based FICO Scores, Non-Revolving And Revolving Loans (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable $ 78,567 $ 82,166
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
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
Financing receivable $ 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%
Total loans $ 28,433 $ 32,017
Consumer | Residential mortgage and home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
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%
Total loans $ 25,681 $ 29,034
Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 790 606
2019 444 1,639
2018 1,044 421
2017 205 29
2016 17 3
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 26 32
Financing Receivable, Revolving 226 253
Total loans 2,752 2,983
FICO Score 720 and Above | Consumer | Residential mortgage and home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 3,613 3,623
2019 3,224 3,796
2018 2,557 2,265
2017 1,509 4,527
2016 3,142 4,390
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 7,058 5,083
Financing Receivable, Revolving 708 821
Total loans 21,811 24,505
FICO Score 720 and Above | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 438 392
2019 292 967
2018 627 258
2017 127 18
2016 11 2
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 4 5
Financing Receivable, Revolving 112 120
Total loans 1,611 1,762
FICO Score Below 720 | Consumer | Residential mortgage and home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 373 419
2019 312 477
2018 363 460
2017 327 762
2016 548 609
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,347 1,121
Financing Receivable, Revolving 160 192
Total loans 3,430 4,040
FICO Score Below 720 | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 352 214
2019 152 672
2018 417 163
2017 78 11
2016 6 1
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 3 2
Financing Receivable, Revolving 112 131
Total loans 1,120 1,194
No FICO Available | Consumer | Residential mortgage and home equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
2020 20 25
2019 27 18
2018 17 18
2017 18 76
2016 49 38
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 297 301
Financing Receivable, Revolving 12 13
Total loans 440 489
No FICO Available | Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
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 19 25
Financing Receivable, Revolving 2 2
Total loans $ 21 $ 27