Loans and Allowance for Loan Losses - Loans in Consumer Portfolio Segment Based FICO Scores, Non-Revolving And Revolving Loans (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable	[1]	$ 89,786	$ 88,213
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2020		1,179
2019		8,474
2018		5,181
2017		7,999
2016		7,055
Prior		8,949
Revolving Loans		1,571
Financing receivable		$ 40,408	$ 42,468
2020 Percentage		3.00%
2019 Percentage		21.00%
2018 Percentage		13.00%
2017 Percentage		20.00%
2016 Percentage		17.00%
Prior Percentage		22.00%
Revolving Percentage		4.00%
Total		100.00%
Consumer | residential mortgage and home equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020		$ 666
2019		5,907
2018		4,318
2017		7,925
2016		7,043
Prior		8,904
Revolving Loans		1,273
Financing receivable		$ 36,036
2020 Percentage		2.00%
2019 Percentage		16.00%
2018 Percentage		12.00%
2017 Percentage		22.00%
2016 Percentage		20.00%
Prior Percentage		25.00%
Revolving Percentage		3.00%
Total		100.00%
Consumer | Other Consumer Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020		$ 513
2019		2,567
2018		863
2017		74
2016		12
Prior		45
Revolving Loans		298
Financing receivable		4,372
FICO Score 720 and Above | Consumer | residential mortgage and home equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020		430
2019		5,039
2018		3,521
2017		6,660
2016		5,948
Prior		7,005
Revolving Loans		1,001
Financing receivable		29,604
FICO Score 720 and Above | Consumer | Other Consumer Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020		302
2019		1,471
2018		500
2017		43
2016		7
Prior		8
Revolving Loans		130
Financing receivable		2,461
FICO Score Below 720 | Consumer | residential mortgage and home equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020		45
2019		848
2018		703
2017		1,103
2016		880
Prior		1,585
Revolving Loans		259
Financing receivable		5,423
FICO Score Below 720 | Consumer | Other Consumer Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020		211
2019		1,096
2018		363
2017		31
2016		5
Prior		5
Revolving Loans		166
Financing receivable		1,877
No FICO Available | Consumer | residential mortgage and home equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020		191
2019		20
2018		94
2017		162
2016		215
Prior		314
Revolving Loans		13
Financing receivable		1,009
No FICO Available | Consumer | Other Consumer Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020		0
2019		0
2018		0
2017		0
2016		0
Prior		32
Revolving Loans		2
Financing receivable		$ 34

[1] Includes $279 million and $320 million at March 31, 2020 and December 31, 2019, respectively, for net unamortized (discounts) and premiums and deferred (fees) and costs.Accrued interest receivable on loans held for investment and securities totaled $469 million at March 31, 2020 and is included in the other assets on the consolidated balance sheet.