Segments (Results of Operations and Average Assets by Segment) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Segment Reporting Information
Net interest income	$ 3,798		$ 3,615		$ 3,533
Provision for (benefit from) loan and lease losses	261		343		396
Net interest income after provision for loan and lease losses	3,537		3,272		3,137
Total noninterest income	3,224		2,696		3,003
Total noninterest expense	3,990		3,903		3,775
Income (Loss) Before Income Taxes	2,771		2,065		2,365
Applicable income tax expense (benefit)	577		505		659
Net income (loss)	2,194		1,560		1,706
Less: Net income attributable to noncontrolling interests	0		(4)		(6)
Net income (loss) attributable to Bancorp	2,194		1,564		1,712
Dividends on preferred stock	75		75		75
Net income (loss) available to common shareholders	2,119		1,489		1,637
Total goodwill	2,445		2,416		2,416
Total Assets	142,193		142,177		141,048
Intersegment Elimination
Segment Reporting Information
Total noninterest income	(132)	[1]	(131)	[2]	(149)	[3]
Total noninterest expense	(132)		(131)		(149)
Commercial Banking
Segment Reporting Information
Net interest income	1,652		1,814		1,625
Provision for (benefit from) loan and lease losses	38		76		298
Net interest income after provision for loan and lease losses	1,614		1,738		1,327
Total noninterest income	838	[4]	907	[5]	853
Total noninterest expense	1,496		1,426		1,369
Income (Loss) Before Income Taxes	956		1,219		811
Applicable income tax expense (benefit)	150		224		93
Net income (loss)	806		995		718
Less: Net income attributable to noncontrolling interests	0		0		0
Net income (loss) attributable to Bancorp	806		995		718
Dividends on preferred stock	0		0		0
Net income (loss) available to common shareholders	806		995		718
Total goodwill	613		613		613
Total Assets	58,568		58,092		58,105
Branch Banking
Segment Reporting Information
Net interest income	1,782		1,669		1,555
Provision for (benefit from) loan and lease losses	153		138		151
Net interest income after provision for loan and lease losses	1,629		1,531		1,404
Total noninterest income	756	[6]	755	[7]	652	[8]
Total noninterest expense	1,621		1,621		1,598
Income (Loss) Before Income Taxes	764		665		458
Applicable income tax expense (benefit)	270		234		161
Net income (loss)	494		431		297
Less: Net income attributable to noncontrolling interests	0		0		0
Net income (loss) attributable to Bancorp	494		431		297
Dividends on preferred stock	0		0		0
Net income (loss) available to common shareholders	494		431		297
Total goodwill	1,655		1,655		1,655
Total Assets	57,892		55,940		53,609
Consumer Lending
Segment Reporting Information
Net interest income	240		248		249
Provision for (benefit from) loan and lease losses	40		44		44
Net interest income after provision for loan and lease losses	200		204		205
Total noninterest income	237		303		407
Total noninterest expense	467		475		440
Income (Loss) Before Income Taxes	(30)		32		172
Applicable income tax expense (benefit)	(11)		12		61
Net income (loss)	(19)		20		111
Less: Net income attributable to noncontrolling interests	0		0		0
Net income (loss) attributable to Bancorp	(19)		20		111
Dividends on preferred stock	0		0		0
Net income (loss) available to common shareholders	(19)		20		111
Total goodwill	0		0		0
Total Assets	22,218		22,041		22,656
Wealth and Asset Management
Segment Reporting Information
Net interest income	154		168		128
Provision for (benefit from) loan and lease losses	6		1		3
Net interest income after provision for loan and lease losses	148		167		125
Total noninterest income	419		399		418
Total noninterest expense	454		422		455
Income (Loss) Before Income Taxes	113		144		88
Applicable income tax expense (benefit)	39		51		30
Net income (loss)	74		93		58
Less: Net income attributable to noncontrolling interests	0		0		0
Net income (loss) attributable to Bancorp	74		93		58
Dividends on preferred stock	0		0		0
Net income (loss) available to common shareholders	74		93		58
Total goodwill	177		148		148
Total Assets	9,485		9,487		9,939
General Corporate and Other
Segment Reporting Information
Net interest income	(30)		(284)		(24)
Provision for (benefit from) loan and lease losses	24		84		(100)
Net interest income after provision for loan and lease losses	(54)		(368)		76
Total noninterest income	1,106		463		822
Total noninterest expense	84		90		62
Income (Loss) Before Income Taxes	968		5		836
Applicable income tax expense (benefit)	129		(16)		314
Net income (loss)	839		21		522
Less: Net income attributable to noncontrolling interests	0		(4)		(6)
Net income (loss) attributable to Bancorp	839		25		528
Dividends on preferred stock	75		75		75
Net income (loss) available to common shareholders	764		(50)		453
Total goodwill	0		0		0
Total Assets	$ (5,970)	[9]	$ (3,383)	[10]	$ (3,261)	[11]

[1] Revenue sharing agreements between wealth and asset management and branch b anking are eliminated in the Consolidated Statements of Income .

[2] Reve nue sharing agreements between wealth and asset management and b ranch b anking are eliminated in the Consolidated Statements of Income.

[3] Revenue sharing agreements between wealth and asset management and b ranch b anking are eliminated in the Consolidated Statements of Income.

[4] Includes impairment charges of $ 52 for operating lease equipment. For more information refer to Note 8 and Note 27 .

[5] Includes impairment charges of $ 20 for operating lease equipment. For more information, refer to Note 8 and Note 27 .

[6] Includes impairment charges of $ 7 for branches and land. For more information refer to Note 7 and Note 27 .

[7] Includes impairment charges of $ 32 for branches and land. For more information refer to Note 7 and Note 27 .

[8] Includes impairment charges of $ 109 for branches and land. For more information refer to Note 7 .

[9] Includes bank premises and equipment of $ 27 classified as held for sale. For more information, refer to Note 7 .

[10] Includes bank premises and equipment of $ 39 classified as held for sale. For more information, refer to Note 7 .

[11] Includes bank premises and equipment of $ 81 classified as held for sale .