Segments (Results of Operations and Average Assets by Segment) (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015		Dec. 31, 2015		Dec. 31, 2014
Segment Reporting Information
Net interest income		$ 907		$ 901		$ 2,712		$ 2,636
Provision for (benefit from) loan and lease losses		80		156		289		305
Net interest income after provision for loan and lease losses		827		745		2,423		2,331
Total noninterest income		840		713		2,075		1,900
Total noninterest expense		973		943		2,942		2,814
Income (Loss) Before Income Taxes		694		515		1,556		1,417
Applicable income tax expense (benefit)		178		134		385		367
Net income (loss)		516		381		1,171		1,050
Less: Net income attributable to noncontrolling interests		0		0		(4)		(6)
Net income (loss) attributable to Bancorp		516		381		1,175		1,056
Dividends on preferred stock		15		15		52		52
Net income (loss) available to common shareholders		501		366		1,123		1,004
Total goodwill		2,416		2,416		2,416		2,416		$ 2,416		$ 2,416
Total Assets		143,279	[1]	141,883	[2]	143,279	[1]	141,883	[2]	$ 141,048	[1]
Intersegment Elimination
Segment Reporting Information
Total noninterest income	[3]	(33)		(38)		(100)		(114)
Total noninterest expense		(33)		(38)		(100)		(114)
Commercial Banking
Segment Reporting Information
Net interest income		456		413		1,367		1,207
Provision for (benefit from) loan and lease losses		(18)		195		119		271
Net interest income after provision for loan and lease losses		474		218		1,248		936
Total noninterest income		228	[4]	228	[5]	683	[6]	630	[7]
Total noninterest expense		349		334		1,065		1,031
Income (Loss) Before Income Taxes		353		112		866		535
Applicable income tax expense (benefit)		74		(9)		151		43
Net income (loss)		279		121		715		492
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		279		121		715		492
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		279		121		715		492
Total goodwill		613		613		613		613
Total Assets		59,392		59,383	[2]	59,392		59,383	[2]
Branch Banking
Segment Reporting Information
Net interest income		414		395		1,272		1,148
Provision for (benefit from) loan and lease losses		34		37		104		116
Net interest income after provision for loan and lease losses		380		358		1,168		1,032
Total noninterest income		163	[8]	197	[9]	566	[10]	468	[11]
Total noninterest expense		402		404		1,223		1,207
Income (Loss) Before Income Taxes		141		151		511		293
Applicable income tax expense (benefit)		50		53		181		103
Net income (loss)		91		98		330		190
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		91		98		330		190
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		91		98		330		190
Total goodwill		1,655		1,655		1,655		1,655
Total Assets		54,955		52,180	[2]	54,955		52,180	[2]
Consumer Lending
Segment Reporting Information
Net interest income		63		62		185		187
Provision for (benefit from) loan and lease losses		12		11		32		33
Net interest income after provision for loan and lease losses		51		51		153		154
Total noninterest income		71		76		234		327
Total noninterest expense		117		107		358		325
Income (Loss) Before Income Taxes		5		20		29		156
Applicable income tax expense (benefit)		2		7		11		56
Net income (loss)		3		13		18		100
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		3		13		18		100
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		3		13		18		100
Total goodwill		0		0		0		0
Total Assets		22,430		22,805	[2]	22,430		22,805	[2]
Wealth and Asset Management
Segment Reporting Information
Net interest income		40		33		127		91
Provision for (benefit from) loan and lease losses		0		0		1		3
Net interest income after provision for loan and lease losses		40		33		126		88
Total noninterest income		99		102		302		315
Total noninterest expense		103		112		317		342
Income (Loss) Before Income Taxes		36		23		111		61
Applicable income tax expense (benefit)		13		9		38		21
Net income (loss)		23		14		73		40
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		23		14		73		40
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		23		14		73		40
Total goodwill		148		148		148		148
Total Assets		8,437		8,965	[2]	8,437		8,965	[2]
General Corporate and Other
Segment Reporting Information
Net interest income		(66)		(2)		(239)		3
Provision for (benefit from) loan and lease losses		52		(87)		33		(118)
Net interest income after provision for loan and lease losses		(118)		85		(272)		121
Total noninterest income		312		148		390		274
Total noninterest expense		35		24		79		23
Income (Loss) Before Income Taxes		159		209		39		372
Applicable income tax expense (benefit)		39		74		4		144
Net income (loss)		120		135		35		228
Less: Net income attributable to noncontrolling interests		0		0		(4)		(6)
Net income (loss) attributable to Bancorp		120		135		39		234
Dividends on preferred stock		15		15		52		52
Net income (loss) available to common shareholders		105		120		(13)		182
Total goodwill		0		0		0		0
Total Assets		$ (1,935)	[12]	$ (1,450)	[2],[13]	$ (1,935)	[12]	$ (1,450)	[2],[13]

[1] Upon adoption of ASU 2015-03 on January 1, 2016, the December 31, 2015 Condensed Consolidated Balance Sheet was adjusted to reflect the reclassification of $34 of debt issuance costs from other assets to long-term debt. For further information refer to Note 3.

[2] Upon adoption of ASU 2015-03 on January 1, 2016, the September 30, 2015 Condensed Consolidated Balance Sheet was adjusted to reflect the reclassification of $35 of debt issuance costs from other assets to long -term debt. For further information refer to Note 3.

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

[4] Includes impairment charges of $ 4 for operating lease equipment. For more information refer to Note 21.

[5] Includes impairment charge s of $ 2 for operating lease equipment. For more information, refer to Note 21.

[6] Includes impairment charges of $ 9 for operating lease equipment. For more information refer to Note 21.

[7] Includes impairment charges of $ 36 for operating lease equipment. For more information refer to Note 21.

[8] Includes impairment charge s of $ 28 for branches and land. For more information refer to Note 7 and Note 21.

[9] Includes impairment charges of $ 2 for branches and land. For more information, refer to Note 7 and Note 21.

[10] Includes impairment charges of $ 31 for branches and land. For more information refer to Note 7 and Note 21.

[11] Includes impairment charge s of $ 1 04 for branches and land. For more information refer to Note 7 and Note 21.

[12] Includes bank premises and equipment of $ 45 classified as held for sale. For mo re information, refer to Note 7.

[13] Includes bank premises and equipment of $81 classified as held f or sale. For more information, refer to Note 7.