Segments (Results of Operations and Average Assets by Segment) (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016		Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information
Net interest income		$ 970		$ 907		$ 2,842		$ 2,712	[1]
Provision for (benefit from) loan and lease losses		67		80		193		289	[1],[2]
Net interest income after provision for loan and lease losses		903		827		2,649		2,423	[1]
Total noninterest income		1,561		840		2,648		2,075	[1]
Total noninterest expense		975		973		2,918		2,942	[1]
Income (Loss) Before Income Taxes		1,489		694		2,379		1,556	[1]
Applicable income tax expense (benefit)		475		178		694		390	[1]
Net income (loss)		1,014		516		1,685		1,166	[1],[2],[3]
Less: Net income attributable to noncontrolling interests		0		0		0		(4)	[1]
Net income (loss) attributable to Bancorp		1,014		516		1,685		1,170	[1]
Dividends on preferred stock		15		15		52		52	[1]
Net income (loss) available to common shareholders		999		501	[4]	1,633		1,118	[1],[5]
Total goodwill		2,423		2,416	[1]	2,423		2,416	[1]	$ 2,416	$ 2,416
Total Assets		142,264		143,279	[1]	142,264		143,279	[1]	$ 142,177
Intersegment Elimination
Segment Reporting Information
Total noninterest income	[6]	(32)		(33)		(99)		(100)
Total noninterest expense		(32)		(33)		(99)		(100)
Commercial Banking
Segment Reporting Information
Net interest income		422		456		1,261		1,367
Provision for (benefit from) loan and lease losses		(3)		(18)		25		119
Net interest income after provision for loan and lease losses		425		474		1,236		1,248
Total noninterest income		216		228	[7]	645	[8]	683	[9]
Total noninterest expense		356		349		1,071		1,065
Income (Loss) Before Income Taxes		285		353		810		866
Applicable income tax expense (benefit)		51		74		138		151
Net income (loss)		234		279		672		715
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		234		279		672		715
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		234		279		672		715
Total goodwill		613		613		613		613
Total Assets		58,752		59,392		58,752		59,392
Branch Banking
Segment Reporting Information
Net interest income		453		414		1,320		1,272
Provision for (benefit from) loan and lease losses		35		34		115		104
Net interest income after provision for loan and lease losses		418		380		1,205		1,168
Total noninterest income		191	[10]	163	[11]	563	[12]	566	[13]
Total noninterest expense		403		402		1,204		1,223
Income (Loss) Before Income Taxes		206		141		564		511
Applicable income tax expense (benefit)		72		50		199		181
Net income (loss)		134		91		365		330
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		134		91		365		330
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		134		91		365		330
Total goodwill		1,655		1,655		1,655		1,655
Total Assets		57,219		54,955		57,219		54,955
Consumer Lending
Segment Reporting Information
Net interest income		59		63		179		185
Provision for (benefit from) loan and lease losses		8		12		30		32
Net interest income after provision for loan and lease losses		51		51		149		153
Total noninterest income		68		71		182		234
Total noninterest expense		116		117		355		358
Income (Loss) Before Income Taxes		3		5		(24)		29
Applicable income tax expense (benefit)		1		2		(8)		11
Net income (loss)		2		3		(16)		18
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		2		3		(16)		18
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		2		3		(16)		18
Total goodwill		0		0		0		0
Total Assets		22,447		22,430		22,447		22,430
Wealth and Asset Management
Segment Reporting Information
Net interest income		38		40		114		127
Provision for (benefit from) loan and lease losses		(1)		0		2		1
Net interest income after provision for loan and lease losses		39		40		112		126
Total noninterest income		101		99		312		302
Total noninterest expense		108		103		334		317
Income (Loss) Before Income Taxes		32		36		90		111
Applicable income tax expense (benefit)		11		13		31		38
Net income (loss)		21		23		59		73
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		21		23		59		73
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		21		23		59		73
Total goodwill		155		148		155		148
Total Assets		8,813		8,437		8,813		8,437
General Corporate and Other
Segment Reporting Information
Net interest income		(2)		(66)		(32)		(239)	[1]
Provision for (benefit from) loan and lease losses		28		52		21		33	[1]
Net interest income after provision for loan and lease losses		(30)		(118)		(53)		(272)	[1]
Total noninterest income		1,017		312		1,045		390	[1]
Total noninterest expense		24		35		53		79	[1]
Income (Loss) Before Income Taxes		963		159		939		39	[1]
Applicable income tax expense (benefit)		340		39		334		9	[1]
Net income (loss)		623		120		605		30	[1]
Less: Net income attributable to noncontrolling interests		0		0		0		(4)	[1]
Net income (loss) attributable to Bancorp		623		120		605		34	[1]
Dividends on preferred stock		15		15		52		52	[1]
Net income (loss) available to common shareholders		608		105		553		(18)	[1]
Total goodwill		0		0	[1]	0		0	[1]
Total Assets		$ (4,967)	[14]	$ (1,935)	[1],[7]	$ (4,967)	[14]	$ (1,935)	[1],[7]

[1] Net tax deficiencies of $ 6 were reclassified from capital surplus to applicable income tax expense for the nine months ended September 30, 2016 , related to the early adoption of ASU 2016-09 during the fourth quarter of 2016, with an effective date of January 1, 2016

[2] Net tax deficiencies of $ 6 were reclassified from capital surplus to applicable income tax expense for the nine months ended September 30, 2016, related to the early adoption of ASU 2016-09 during the fourth quarter of 2016, with an effective date of January 1, 2016.

[3] Net tax deficiencies of $6 million were reclassified from capital surplus to applicable income tax expense for the nine months ended September 30, 2016, related to the early adoption of ASU 2016-09 during the fourth quarter of 2016, with an e ffective date of January 1, 2016.

[4] A verage common shares outstanding - diluted were adjuste d for the three months ended September 30, 2016 related to the early adoption of ASU 2016-09 during the fourth quarter of 2016, with an effective date of January 1, 2016

[5] Net tax deficiencies of $6 were reclassified from capital surplus to applicable income tax expense and average common shares outstanding - d iluted were adjusted for the nine months ended September 30, 2016 related to the early adoption of ASU 2016-09 during the fourth quarter of 2016, with an effective date of January 1, 2016 .

[6] Revenue sharing agreements between wealth and asset management and branch banking are eliminated in the Condensed Consolidated Statements of Income.

[7] Includes impairment charges of $ 4 for operating lease equipment. For more information refer to Note 9 and Note 25 .

[8] Includes impairment charges of $ 31 for operating lease equipment. For more information refer to Note 9 and Note 25 .

[9] Includes impairment charges of $ 9 for operating lease equipment. For more information refer to Note 9 and Note 25 .

[10] Includes impairment charges of $ 1 for branches and land. For more information refer to Note 7 and Note 23 .

[11] Includes impairment charges of $ 28 for branches and land. For more information refer to Note 8 and Note 25 .

[12] Includes impairment charges of $ 6 for branches and land. For more information refer to Note 8 and Note 25 .

[13] Includes impairment charge s of $ 31 for branches and land. For more information refer to Note 8 and Note 25 .

[14] Includes bank premises and equipment of $ 36 classified as hel d for sale. For more information refer to Note 7