Loans and Allowance for Loan Losses - Loans in Consumer Portfolio Segment Based On LTV Ratios, Revolving and Nonrevolving (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Credit quality of consumer loans
Financing receivable	[1]	$ 89,786	$ 88,213
Consumer
Credit quality of consumer loans
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]
Credit quality of consumer loans
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 | residential mortgage and home equity [Member] | 80% or below
Credit quality of consumer loans
2020		$ 662
2019		5,093
2018		3,819
2017		7,799
2016		7,030
Prior		8,809
Revolving Loans		1,112
Financing receivable		34,324
Consumer | residential mortgage and home equity [Member] | 80% to 100%
Credit quality of consumer loans
2020		4
2019		812
2018		494
2017		124
2016		12
Prior		54
Revolving Loans		155
Financing receivable		1,655
Consumer | residential mortgage and home equity [Member] | 100% or more
Credit quality of consumer loans
2020		0
2019		0
2018		3
2017		0
2016		0
Prior		9
Revolving Loans		1
Financing receivable		13
Consumer | residential mortgage and home equity [Member] | No LTV Available
Credit quality of consumer loans
2020		0
2019		2
2018		2
2017		2
2016		1
Prior		32
Revolving Loans		5
Financing receivable		44
Consumer Portfolio Segment Related to LTV Ratios [Member]
Credit quality of consumer loans
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

[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.