CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited) - USD ($) $ in Millions	Total	Series H Preferred Stock	Series I Preferred Stock	Series J Preferred Stock	Series K Preferred Stock	Series L Preferred Stock	Class B, Series A Preferred Stock	Other Preferred Stock	[1]	Cumulative Effect, Period of Adoption, Adjustment		Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Preferred Stock	Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Capital Surplus	Capital Surplus Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Series H Preferred Stock	Retained Earnings Series I Preferred Stock	Retained Earnings Series J Preferred Stock	Retained Earnings Series K Preferred Stock	Retained Earnings Series L Preferred Stock	Retained Earnings Class B, Series A Preferred Stock	Retained Earnings Other Preferred Stock	[1]	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment		Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Treasury Stock	Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Total Bancorp Shareholders’ Equity	Total Bancorp Shareholders’ Equity Series H Preferred Stock	Total Bancorp Shareholders’ Equity Series I Preferred Stock	Total Bancorp Shareholders’ Equity Series J Preferred Stock	Total Bancorp Shareholders’ Equity Series K Preferred Stock	Total Bancorp Shareholders’ Equity Series L Preferred Stock	Total Bancorp Shareholders’ Equity Class B, Series A Preferred Stock	Total Bancorp Shareholders’ Equity Other Preferred Stock	[1]	Total Bancorp Shareholders’ Equity Cumulative Effect, Period of Adoption, Adjustment		Total Bancorp Shareholders’ Equity Cumulative Effect, Period of Adoption, Adjusted Balance	Non- Controlling Interests	Non- Controlling Interests Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning Balance at Dec. 31, 2018	$ 16,250									$ 10		$ 16,260	$ 2,051	$ 2,051	$ 1,331	$ 1,331	$ 2,873	$ 2,873	$ 16,578									$ 10		$ 16,588	$ (112)	$ (112)	$ (6,471)	$ (6,471)	$ 16,250									$ 10		$ 16,260	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,778																		1,778																1,778
Other comprehensive income, net of tax	1,747																														1,747				1,747
Cash dividends declared:
Common stock	(518)																		(518)																(518)
Preferred stock		$ (15)	$ (23)	$ (15)			$ (1)	$ (6)												$ (15)	$ (23)	$ (15)			$ (1)	$ (6)										$ (15)	$ (23)	$ (15)			$ (1)	$ (6)
Shares acquired for treasury	(1,463)																																(1,463)		(1,463)
Issuance of preferred stock	242														242																				242
Conversion of outstanding preferred stock issued by a Bancorp subsidiary	0														197																				197												(197)
Impact of MB Financial, Inc. acquisition	3,356																712																2,447		3,159												197
Impact of stock transactions under stock compensation plans, net	59																5		1														53		59
Other	3																(1)		(3)														7		3
Ending Balance at Sep. 30, 2019	21,404												2,051		1,770		3,589		17,786												1,635		(5,427)		21,404												0
Beginning Balance at Jun. 30, 2019	20,671												2,051		1,331		3,572		17,431												1,178		(5,089)		20,474												197
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	549																		549																549
Other comprehensive income, net of tax	457																														457				457
Cash dividends declared:
Common stock	(175)																		(175)																(175)
Preferred stock			(8)	(7)			(1)	$ (3)													(8)	(7)			(1)	$ (3)											(8)	(7)			(1)	$ (3)
Shares acquired for treasury	(350)																																(350)		(350)
Issuance of preferred stock	242														242																				242
Conversion of outstanding preferred stock issued by a Bancorp subsidiary	0														197																				197												(197)
Impact of stock transactions under stock compensation plans, net	24																17																7		24
Other	5																																5		5
Ending Balance at Sep. 30, 2019	21,404												2,051		1,770		3,589		17,786												1,635		(5,427)		21,404												0
Beginning Balance at Dec. 31, 2019	21,203									$ (472)	[2]	$ 20,731	2,051	$ 2,051	1,770	$ 1,770	3,599	$ 3,599	18,315									$ (472)	[2]	$ 17,843	1,192	$ 1,192	(5,724)	$ (5,724)	21,203									$ (472)	[2]	$ 20,731	0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	823																		823																823
Other comprehensive income, net of tax	1,639																														1,639				1,639
Cash dividends declared:
Common stock	(585)																		(585)																(585)
Preferred stock		$ (15)	(23)	(10)	$ (9)	$ (3)	(9)													$ (15)	(23)	(10)	$ (9)	$ (3)	(9)											$ (15)	(23)	(10)	$ (9)	$ (3)	(9)
Issuance of preferred stock	346														346																				346
Impact of stock transactions under stock compensation plans, net	66																25																41		66
Other	0																		(2)														2		0
Ending Balance at Sep. 30, 2020	22,951												2,051		2,116		3,624		18,010												2,831		(5,681)		22,951												0
Beginning Balance at Jun. 30, 2020	22,335												2,051		1,770		3,603		17,643												2,951		(5,683)		22,335												0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	581																		581																581
Other comprehensive income, net of tax	(120)																														(120)				(120)
Cash dividends declared:
Common stock	(195)																		(195)																(195)
Preferred stock			$ (7)	$ (3)	$ (3)	$ (3)	$ (3)														$ (7)	$ (3)	$ (3)	$ (3)	$ (3)												$ (7)	$ (3)	$ (3)	$ (3)	$ (3)
Issuance of preferred stock	346														346																				346
Impact of stock transactions under stock compensation plans, net	23																21																2		23
Ending Balance at Sep. 30, 2020	$ 22,951												$ 2,051		$ 2,116		$ 3,624		$ 18,010												$ 2,831		$ (5,681)		$ 22,951												$ 0

[1] Dividends declared for Perpetual Preferred Stock, Series C, of MB Financial, Inc., a subsidiary of the Bancorp.

[2] Related to the adoption of ASU 2016-13 as of January 1, 2020. Refer to Note 4 for additional information.