Loans and Allowance for Loan Losses - Loans in Consumer Portfolio Accrual and Nonaccrual (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable	[1]	$ 89,786	$ 88,213
Consumer
Accounts, Notes, Loans and Financing Receivable [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
Consumer | residential mortgage and home equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020		0
2019		2
2018		3
2017		7
2016		8
Prior		121
Revolving loans		5
Financing receivable		146
2020		666
2019		5,907
2020		666
2019		5,905
2018		4,315
2017		7,918
2016		7,035
Prior		8,783
Revolving loans		1,268
Financing receivable		35,890
2018		4,318
2017		7,925
2016		7,043
Prior		8,904
Revolving Loans		1,273
Financing receivable		36,036
Consumer | Other Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2020		0
2019		0
2018		0
2017		0
2016		1
Prior		2
Revolving loans		0
Financing receivable		3
2020		513
2019		2,567
2020		513
2019		2,567
2018		863
2017		74
2016		11
Prior		43
Revolving loans		298
Financing receivable		4,369
2018		863
2017		74
2016		12
Prior		45
Revolving Loans		298
Financing receivable		$ 4,372

[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.