Segments (Results of Operations and Average Assets by Segment) (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2017		Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016		Dec. 31, 2016
Segment Reporting Information
Net interest income		$ 939		$ 902	[1],[2]	$ 1,872		$ 1,805	[3]
Provision for (benefit from) loan and lease losses		52		91	[1],[2]	126		210	[3],[4]
Net interest income after provision for loan and lease losses		887		811	[1],[2]	1,746		1,595	[3]
Total noninterest income		564		599	[1],[2]	1,087		1,235	[3]
Total noninterest expense		957		983	[1],[2]	1,943		1,968	[3]
Income (Loss) Before Income Taxes		494		427	[1],[2]	890		862	[3]
Applicable income tax expense (benefit)		127		103	[1],[2]	218		212	[3]
Net income (loss)		367		324	[1],[2],[5]	672		650	[3],[4],[5]
Less: Net income attributable to noncontrolling interests		0		(4)	[1],[2]	0		(4)	[3]
Net income (loss) attributable to Bancorp		367		328	[1],[2],[6]	672		654	[3]
Dividends on preferred stock		23		23	[1],[2],[6]	38		38	[3]
Net income (loss) available to common shareholders		344		305	[1],[7]	634		616	[3],[6]
Total goodwill		2,423	[1]	2,416	[1],[3]	2,423	[1]	2,416	[1],[3]	$ 2,416
Total Assets		141,067	[1]	143,625	[1],[3]	141,067	[1]	143,625	[1],[3]	$ 142,177
Intersegment Elimination
Segment Reporting Information
Total noninterest income	[8]	(33)		(34)		(67)		(67)
Total noninterest expense		(33)		(34)		(67)		(67)
Commercial Banking
Segment Reporting Information
Net interest income		415		460		839		911
Provision for (benefit from) loan and lease losses		22		72		29		137
Net interest income after provision for loan and lease losses		393		388		810		774
Total noninterest income		228		236	[9]	429	[10]	457	[11]
Total noninterest expense		345		355		714		716
Income (Loss) Before Income Taxes		276		269		525		515
Applicable income tax expense (benefit)		49		43		88		77
Net income (loss)		227		226		437		438
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		227		226		437		438
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		227		226		437		438
Total goodwill		613		613		613		613
Total Assets		57,766		60,042		57,766		60,042
Branch Banking
Segment Reporting Information
Net interest income		437		433		867		859
Provision for (benefit from) loan and lease losses		39		35		80		69
Net interest income after provision for loan and lease losses		398		398		787		790
Total noninterest income		189	[12]	214	[13]	374	[14]	401	[15]
Total noninterest expense		399		409		801		820
Income (Loss) Before Income Taxes		188		203		360		371
Applicable income tax expense (benefit)		66		71		127		131
Net income (loss)		122		132		233		240
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		122		132		233		240
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		122		132		233		240
Total goodwill		1,655		1,655		1,655		1,655
Total Assets		57,378		54,220		57,378		54,220
Consumer Lending
Segment Reporting Information
Net interest income		59		62		120		122
Provision for (benefit from) loan and lease losses		7		9		22		21
Net interest income after provision for loan and lease losses		52		53		98		101
Total noninterest income		62		80		116		164
Total noninterest expense		123		122		241		240
Income (Loss) Before Income Taxes		(9)		11		(27)		25
Applicable income tax expense (benefit)		(3)		4		(10)		9
Net income (loss)		(6)		7		(17)		16
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		(6)		7		(17)		16
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		(6)		7		(17)		16
Total goodwill		0		0		0		0
Total Assets		22,442		22,598		22,442		22,598
Wealth and Asset Management
Segment Reporting Information
Net interest income		37		44		75		87
Provision for (benefit from) loan and lease losses		(1)		1		3		1
Net interest income after provision for loan and lease losses		38		43		72		86
Total noninterest income		101		100		209		202
Total noninterest expense		110		108		224		215
Income (Loss) Before Income Taxes		29		35		57		73
Applicable income tax expense (benefit)		10		12		20		25
Net income (loss)		19		23		37		48
Less: Net income attributable to noncontrolling interests		0		0		0		0
Net income (loss) attributable to Bancorp		19		23		37		48
Dividends on preferred stock		0		0		0		0
Net income (loss) available to common shareholders		19		23		37		48
Total goodwill		155		148		155		148
Total Assets		8,241		8,399		8,241		8,399
General Corporate and Other
Segment Reporting Information
Net interest income		(9)		(97)	[1]	(29)		(174)	[3]
Provision for (benefit from) loan and lease losses		(15)		(26)	[1]	(8)		(18)	[3]
Net interest income after provision for loan and lease losses		6		(71)	[1]	(21)		(156)	[3]
Total noninterest income		17		3	[1]	26		78	[3]
Total noninterest expense		13		23	[1]	30		44	[3]
Income (Loss) Before Income Taxes		10		(91)	[1]	(25)		(122)	[3]
Applicable income tax expense (benefit)		5		(27)	[1]	(7)		(30)	[3]
Net income (loss)		5		(64)	[1]	(18)		(92)	[3]
Less: Net income attributable to noncontrolling interests		0		(4)	[1]	0		(4)	[3]
Net income (loss) attributable to Bancorp		5		(60)	[1]	(18)		(88)	[3]
Dividends on preferred stock		23		23	[1]	38		38	[3]
Net income (loss) available to common shareholders		(18)		(83)	[1]	(56)		(126)	[3]
Total goodwill		0		0	[1],[3]	0		0	[1],[3]
Total Assets		$ (4,760)	[16]	$ (1,634)	[1],[3],[9]	$ (4,760)	[16]	$ (1,634)	[1],[3],[9]

[1] A net tax deficiency of $ 5 was reclassified from capital surplus to applicable income tax expense for the three months ended June 30, 2016, related to the early adoption of ASU 2016-09 during the fourth quarter of 2016, with an effe ctive date of January 1, 2016.

[2] Net tax deficiencies of $ 5 and $6 were reclassified from capital surplus to applicable income tax expense and average common shares out standing – diluted were adjusted for t he three and six months ended June 30, 2016, respectively, 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 were reclassified from capital surplus to applicable income tax expense for the six months ended June 30, 2016 related to the early adoption of ASU 2016-09 during the fourth quarter of 2016, with an effective d ate of January 1, 2016

[4] Net tax deficiencies of $ 6 were reclassified from capital surplus to applicable income tax expense for the six months ended June 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 $5 and $6 were reclassified from capital surplus to applicable income tax expense for the three and six months ended June 30, 2016, respectively, related to the early adoption of ASU 2016-09 during the fourth quarter of 2016, with an ef fective date of January 1, 2016.

[6] Net tax deficiencies of $6 were reclassified from capital surplus to applicable income tax expense and average common shares outstanding - diluted were adjusted for the six months ended June 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 .

[7] A net tax deficiency of $5 was reclassified from capital surplus to applicable income tax expense and average common shares outstanding - diluted were adjusted for the three months ended June 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

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

[9] Includes impairment charges of $ 5 for operating lease equipment. For more information refer to Note 8 and Note 21 .

[10] Includes impairment charges of $ 31 for operating lease equipment. For more information refer to Note 8 and Note 21.

[11] Includes impairment charges of $ 5 for operating lease equipment. For more information refer to Note 8 and Note 21.

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

[13] Includes impairment charges of $ 1 for branches and land. For more information refer to Note 7 and Note 21.

[14] Includes impairment charges of $ 5 for branches and land. For more information refer to Note 7 and Note 21.

[15] Includes impairment charge s of $ 3 for branches and land. For more information refer to Note 7 and Note 21.

[16] Includes bank premises and equipment of $ 4 1 classified as hel d for sale. For more information refer to Note 7