Disaggregation of Revenue (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		$ 3,354	$ 3,383
Revenue from Contract with Customer, Including Assessed Tax	[1]	$ 3,226
Contract with Customer, Performance Obligation Satisfied in Previous Period		50
In Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax		1,992
In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		636	572
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	605
In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		1,419	1,444
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	1,387
Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[3]		1,299	1,367
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3]	1,234
Out of Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			937	753
Revenue from Contract with Customer, Including Assessed Tax		929
Out of Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			486	623
Revenue from Contract with Customer, Including Assessed Tax		417
Out of Scope of ASC 606 [Member] | Corporate Other [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax			(124)	(9)
Revenue from Contract with Customer, Including Assessed Tax		(112)
Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		603	630
Revenue from Contract with Customer, Including Assessed Tax	[1]	579
Deposit Account [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		143	148
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	135
Deposit Account [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		460	482
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	444
Deposit Account [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[3]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3]	0
Financial Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[4],[5]		361	359
Revenue from Contract with Customer, Including Assessed Tax	[1],[4],[5]	356
Financial Service, Other [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[4],[5]		12	11
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[4],[5]	12
Financial Service, Other [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[4],[5]		124	130
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[4],[5]	114
Financial Service, Other [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[3],[4],[5]		225	218
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3],[4],[5]	230
Credit and Debit Card [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		344	327
Revenue from Contract with Customer, Including Assessed Tax	[1]	324
Credit and Debit Card [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		108	93
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	104
Credit and Debit Card [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		232	228
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	216
Credit and Debit Card [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[3]		4	6
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3]	4
Investment Banking [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[4]		623	515
Revenue from Contract with Customer, Including Assessed Tax	[1],[4]	599
Investment Banking [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[4]		371	317
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[4]	352
Investment Banking [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[4]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[4]	0
Investment Banking [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[3],[4]		252	198
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3],[4]	247
Trading [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		189	211
Revenue from Contract with Customer, Including Assessed Tax	[1]	161
Trading [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	0
Trading [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	0
Trading [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[3]		189	211
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3]	161
Mortgage Banking [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		422	555
Revenue from Contract with Customer, Including Assessed Tax	[1]	342
Mortgage Banking [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	0
Mortgage Banking [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	0
Mortgage Banking [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[3]		422	555
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3]	342
Fiduciary and Trust [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		309	304
Revenue from Contract with Customer, Including Assessed Tax	[1]	304
Fiduciary and Trust [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[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],[2]		302	300
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	301
Fiduciary and Trust [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[3]		7	4
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3]	3
Investment Advisory, Management and Administrative Service [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[6]		278	281
Revenue from Contract with Customer, Including Assessed Tax	[1],[6]	292
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],[2],[6]		2	3
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[6]	2
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],[2],[6]		275	277
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[6]	289
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],[2],[3],[6]		1	1
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3],[6]	1
Commercial Real Estate [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		123	69
Revenue from Contract with Customer, Including Assessed Tax	[1]	134
Commercial Real Estate [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[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],[2]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	0
Commercial Real Estate [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[3]		123	69
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3]	134
Net Securities Gains/(Losses) [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		(108)	4
Revenue from Contract with Customer, Including Assessed Tax	[1]	1
Net Securities Gains/(Losses) [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[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],[2]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[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],[2],[3]		(108)	4
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3]	1
Other Income [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1]		103	128
Revenue from Contract with Customer, Including Assessed Tax	[1]	134
Other Income [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		0	0
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	0
Other Income [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2]		26	27
Revenue from Contract with Customer, Including Assessed Tax	[1],[2]	23
Other Income [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[1],[2],[3]		77	$ 101
Revenue from Contract with Customer, Including Assessed Tax	[1],[2],[3]	$ 111
Sale of Subsidiary Gain (Loss) [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[7]		107
Sale of Subsidiary Gain (Loss) [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[7],[8]		0
Sale of Subsidiary Gain (Loss) [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[7],[8]		0
Sale of Subsidiary Gain (Loss) [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax	[7],[8],[9]		$ 107

[1] Amounts are presented in accordance with ASC Topic 606, Revenue from Contracts with Customers, except for out of scope amounts.

[2] Consumer total noninterest income and Wholesale total noninterest income exclude $417 million and $929 million of out of scope noninterest income, respectively, which are included in the business segment results presented on a management accounting basis in Note 22, "Business Segment Reporting." Out of scope total noninterest income includes these amounts and also includes ($112) 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] 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.

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

[6] The Company recognized $50 million of mutual fund 12b-1 fees and annuity trailing commissions, the majority of which related to performance obligations satisfied in periods prior to December 31, 2018.

[7] Amounts for periods prior to January 1, 2018 are presented in accordance with ASC Topic 605, Revenue Recognition, and have not been restated to conform with ASC Topic 606, Revenue from Contracts with Customers.

[8] Consumer total noninterest income and Wholesale total noninterest income exclude $486 million and $937 million of out of scope noninterest income, respectively, which are included in the business segment results presented on a management accounting basis in Note 22, "Business Segment Reporting." Out of scope total noninterest income includes these amounts and also includes ($124) million of Corporate Other noninterest income that is not subject to ASC Topic 606.

[9] 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.