Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2019		Sep. 30, 2018		Sep. 30, 2019		Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ (843)		$ (782)		$ (2,653)		$ (2,408)
Contract with Customer, Performance Obligation Satisfied in Previous Period	12		12		$ 31		38
Document Period End Date					Sep. 30, 2019
In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(154)	[1]	(163)	[2]	$ (442)	[3]	(478)	[4]
In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(355)	[1]	(345)	[2]	(1,029)	[3]	(1,036)	[4]
Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(334)	[1],[5]	(274)	[2],[6]	(1,182)	[3],[7]	(894)	[4],[8]
Out of Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax							618
Revenue from Contract with Customer, Including Assessed Tax	(214)		(205)		(695)
Out of Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax							311
Revenue from Contract with Customer, Including Assessed Tax	(124)		(99)		(386)
Out of Scope of ASC 606 [Member] | Corporate Other [Member]
Disaggregation of Revenue [Line Items]
Revenue Recognition, Including Assessed Tax							(35)
Revenue from Contract with Customer, Including Assessed Tax	4		30		(101)
Deposit Account [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(141)		(144)		(417)		(433)
Deposit Account [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(29)	[1]	(33)	[2]	(93)	[3]	(103)	[4]
Deposit Account [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(112)	[1]	(111)	[2]	(324)	[3]	(330)	[4]
Deposit Account [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1],[5]	0	[2],[6]	0	[3],[7]	0	[4],[8]
Financial Service, Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(90)	[9]	(89)	[10]	(265)	[11]	(264)	[12]
Financial Service, Other [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(4)	[1],[9]	(3)	[2],[10]	(12)	[3],[11]	(8)	[4],[12]
Financial Service, Other [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(27)	[1],[9]	(28)	[2],[10]	(82)	[3],[11]	(85)	[4],[12]
Financial Service, Other [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(59)	[1],[5],[9]	(58)	[2],[6],[10]	(171)	[3],[7],[11]	(171)	[4],[8],[12]
Credit and Debit Card [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(83)		(75)		(247)		(241)
Credit and Debit Card [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(24)	[1]	(26)	[2]	(75)	[3]	(78)	[4]
Credit and Debit Card [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(57)	[1]	(49)	[2]	(168)	[3]	(160)	[4]
Credit and Debit Card [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(2)	[1],[5]	0	[2],[6]	(4)	[3],[7]	(3)	[4],[8]
Investment Banking [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(159)		(150)		(431)		(453)
Investment Banking [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(97)	[1]	(101)	[2]	(261)	[3]	(287)	[4]
Investment Banking [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Investment Banking [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(62)	[1],[5]	(49)	[2],[6]	(170)	[3],[7]	(166)	[4],[8]
Trading [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(29)		(42)		(144)		(137)
Trading [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Trading [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Trading [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(29)	[1],[5]	(42)	[2],[6]	(144)	[3],[7]	(137)	[4],[8]
Insurance Settlement [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(5)		0		(210)		0
Insurance Settlement [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Insurance Settlement [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Insurance Settlement [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(5)	[1],[5]	0	[2],[6]	(210)	[3],[7]	0	[4],[8]
Mortgage Banking [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(106)		(83)		(294)		(256)
Mortgage Banking [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Mortgage Banking [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Mortgage Banking [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(106)	[1],[5]	(83)	[2],[6]	(294)	[3],[7]	(256)	[4],[8]
Fiduciary and Trust [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(78)		(80)		(222)		(230)
Fiduciary and Trust [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Fiduciary and Trust [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(77)	[1]	(79)	[2]	(220)	[3]	(228)	[4]
Fiduciary and Trust [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(1)	[1],[5]	(1)	[2],[6]	(2)	[3],[7]	(2)	[4],[8]
Investment Advisory, Management and Administrative Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(76)	[13]	(74)	[14]	(220)	[15]	(219)	[16]
Investment Advisory, Management and Administrative Service [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1],[13]	0	[2],[14]	(1)	[3],[15]	(2)	[4],[16]
Investment Advisory, Management and Administrative Service [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(76)	[1],[13]	(73)	[2],[14]	(218)	[3],[15]	(216)	[4],[16]
Investment Advisory, Management and Administrative Service [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1],[5],[13]	(1)	[2],[6],[14]	(1)	[3],[7],[15]	(1)	[4],[8],[16]
Commercial Real Estate [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(32)		(24)		(106)		(66)
Commercial Real Estate [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Commercial Real Estate [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Commercial Real Estate [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(32)	[1],[5]	(24)	[2],[6]	(106)	[3],[7]	(66)	[4],[8]
Net Securities Gains/(Losses) [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4		0		(38)		(1)
Net Securities Gains/(Losses) [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Net Securities Gains/(Losses) [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Net Securities Gains/(Losses) [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4	[1],[5]	0	[2],[6]	(38)	[3],[7]	(1)	[4],[8]
Other Income [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(40)		(21)		(135)		(108)
Other Income [Member] | In Scope of ASC 606 [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0	[1]	0	[2]	0	[3]	0	[4]
Other Income [Member] | In Scope of ASC 606 [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(6)	[1]	(5)	[2]	(17)	[3]	(17)	[4]
Other Income [Member] | Out of Scope of ASC 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ (34)	[1],[5]	$ (16)	[2],[6]	$ (118)	[3],[7]	$ (91)	[4],[8]

[1] Consumer total noninterest income and Wholesale total noninterest income exclude $124 million and $214 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 ($4) 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 $99 million and $205 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 ($30) million of Corporate Other noninterest income that is not subject to ASC Topic 606.

[3] Consumer total noninterest income and Wholesale total noninterest income exclude $386 million and $695 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 $101 million of Corporate Other noninterest income that is not subject to ASC Topic 606.

[4] Consumer total noninterest income and Wholesale total noninterest income exclude $311 million and $618 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 ($35) million of Corporate Other noninterest income that is not subject to ASC Topic 606.

[5] 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.

[6] 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.

[7] 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.

[8] 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.

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

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

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

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

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

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

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

[16] The Company recognized $38 million of mutual fund 12b-1 fees and annuity trailing commissions, the majority of which related to performance obligations satisfied in prior periods.