Disaggregation of Revenue (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			$ 796
Revenue from Contract with Customer, Including Assessed Tax		$ 784
Contract with Customer, Performance Obligation Satisfied in Previous Period		11
In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		158
Revenue from Contract with Customer, Including Assessed Tax	[2]	135
In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		338
Revenue from Contract with Customer, Including Assessed Tax	[2]	332
Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3]		300
Revenue from Contract with Customer, Including Assessed Tax	[2],[4]	317
Out of Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			182
Revenue from Contract with Customer, Including Assessed Tax		229
Out of Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			112
Revenue from Contract with Customer, Including Assessed Tax		114
Out of Scope of ASC 606 [Member] | Corporate Other [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			6
Revenue from Contract with Customer, Including Assessed Tax		(26)
Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			146
Revenue from Contract with Customer, Including Assessed Tax		137
Deposit Account [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		42
Revenue from Contract with Customer, Including Assessed Tax	[2]	33
Deposit Account [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		104
Revenue from Contract with Customer, Including Assessed Tax	[2]	104
Deposit Account [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3]		0
Revenue from Contract with Customer, Including Assessed Tax	[2],[4]	0
Financial Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[5],[6]		85
Revenue from Contract with Customer, Including Assessed Tax	[7]	87
Financial Service, Other [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[5],[6]		3
Revenue from Contract with Customer, Including Assessed Tax	[2],[7]	4
Financial Service, Other [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[5],[6]		28
Revenue from Contract with Customer, Including Assessed Tax	[2],[7]	27
Financial Service, Other [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3],[5],[6]		54
Revenue from Contract with Customer, Including Assessed Tax	[2],[4],[7]	56
Credit and Debit Card [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			81
Revenue from Contract with Customer, Including Assessed Tax		82
Credit and Debit Card [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		26
Revenue from Contract with Customer, Including Assessed Tax	[2]	26
Credit and Debit Card [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		54
Revenue from Contract with Customer, Including Assessed Tax	[2]	55
Credit and Debit Card [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3]		1
Revenue from Contract with Customer, Including Assessed Tax	[2],[4]	1
Investment Banking [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[5]		133
Revenue from Contract with Customer, Including Assessed Tax		130
Investment Banking [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[5]		86
Revenue from Contract with Customer, Including Assessed Tax	[2]	72
Investment Banking [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[5]		0
Revenue from Contract with Customer, Including Assessed Tax	[2]	0
Investment Banking [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3],[5]		47
Revenue from Contract with Customer, Including Assessed Tax	[2],[4]	58
Trading [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			42
Revenue from Contract with Customer, Including Assessed Tax		60
Trading [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		0
Revenue from Contract with Customer, Including Assessed Tax	[2]	0
Trading [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		0
Revenue from Contract with Customer, Including Assessed Tax	[2]	0
Trading [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3]		42
Revenue from Contract with Customer, Including Assessed Tax	[2],[4]	60
Mortgage Banking [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			90
Revenue from Contract with Customer, Including Assessed Tax		100
Mortgage Banking [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		0
Revenue from Contract with Customer, Including Assessed Tax	[2]	0
Mortgage Banking [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		0
Revenue from Contract with Customer, Including Assessed Tax	[2]	0
Mortgage Banking [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3]		90
Revenue from Contract with Customer, Including Assessed Tax	[2],[4]	100
Fiduciary and Trust [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			75
Revenue from Contract with Customer, Including Assessed Tax		71
Fiduciary and Trust [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		0
Revenue from Contract with Customer, Including Assessed Tax	[2]	0
Fiduciary and Trust [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		75
Revenue from Contract with Customer, Including Assessed Tax	[2]	71
Fiduciary and Trust [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3]		0
Revenue from Contract with Customer, Including Assessed Tax	[2],[4]	0
Investment Advisory, Management and Administrative Service [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[8]		72
Revenue from Contract with Customer, Including Assessed Tax	[9]	69
Investment Advisory, Management and Administrative Service [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[8]		1
Revenue from Contract with Customer, Including Assessed Tax	[2],[9]	0
Investment Advisory, Management and Administrative Service [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[8]		71
Revenue from Contract with Customer, Including Assessed Tax	[2],[9]	69
Investment Advisory, Management and Administrative Service [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3],[8]		0
Revenue from Contract with Customer, Including Assessed Tax	[2],[4],[9]	0
Commercial Real Estate [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			23
Revenue from Contract with Customer, Including Assessed Tax		24
Commercial Real Estate [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		0
Revenue from Contract with Customer, Including Assessed Tax	[2]	0
Commercial Real Estate [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		0
Revenue from Contract with Customer, Including Assessed Tax	[2]	0
Commercial Real Estate [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3]		23
Revenue from Contract with Customer, Including Assessed Tax	[2],[4]	24
Net Securities Gains/(Losses) [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			1
Revenue from Contract with Customer, Including Assessed Tax		0
Net Securities Gains/(Losses) [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		0
Revenue from Contract with Customer, Including Assessed Tax	[2]	0
Net Securities Gains/(Losses) [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		0
Revenue from Contract with Customer, Including Assessed Tax	[2]	0
Net Securities Gains/(Losses) [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3]		1
Revenue from Contract with Customer, Including Assessed Tax	[2],[4]	0
Other Income [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			48
Revenue from Contract with Customer, Including Assessed Tax		24
Other Income [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		0
Revenue from Contract with Customer, Including Assessed Tax	[2]	0
Other Income [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		6
Revenue from Contract with Customer, Including Assessed Tax	[2]	6
Other Income [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[3]		$ 42
Revenue from Contract with Customer, Including Assessed Tax	[2],[4]	$ 18

[1] Consumer total noninterest income and Wholesale total noninterest income exclude $112 million and $182 million of out of scope noninterest income, respectively, which are included in the business segment results presented on a management accounting basis in Note 19, "Business Segment Reporting." Out of scope total noninterest income includes these amounts and also includes $6 million of Corporate Other noninterest income that is not subject to ASC Topic 606.

[2] Consumer total noninterest income and Wholesale total noninterest income exclude $114 million and $229 million of out of scope noninterest income, respectively, which are included in the business segment results presented on a management accounting basis in Note 19, "Business Segment Reporting." Out of scope total noninterest income includes these amounts and also includes ($26) million of Corporate Other noninterest income that is not subject to ASC Topic 606.

[3] The Company presents out of scope noninterest income for the purpose of reconciling noninterest income amounts within the scope of ASC Topic 606 to noninterest income amounts presented on the Company's Consolidated Statements of Income.

[4] The Company presents out of scope noninterest income for the purpose of reconciling noninterest income amounts within the scope of ASC Topic 606 to noninterest income amounts presented on the Company's Consolidated Statements of Income.

[5] Beginning July 1, 2018, the Company began presenting bridge commitment fee income related to capital market transactions in Investment banking income on the Consolidated Statements of Income. For periods prior to July 1, 2018, this income was previously presented in Other charges and fees and has been reclassified to Investment banking income for comparability.

[6] The Company recognized an immaterial amount of insurance trailing commissions, the majority of which related to performance obligations satisfied in prior periods.

[7] The Company recognized an immaterial amount of insurance trailing commissions, the majority of which related to performance obligations satisfied in prior periods.

[8] The Company recognized $13 million of mutual fund 12b-1 fees and annuity trailing commissions, the majority of which related to performance obligations satisfied in periods prior to March 31, 2018.

[9] The Company recognized $11 million of mutual fund 12b-1 fees and annuity trailing commissions, the majority of which related to performance obligations satisfied in periods prior to March 31, 2019.