Segments (Results of Operations and Average Assets by Segment) (Detail) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015		Dec. 31, 2015
Segment Reporting Information
Net interest income		$ 902		$ 887		$ 1,805		$ 1,734
Provision for loan and lease losses		91		79		210		148
Net interest income after provision for loan and lease losses		811		808		1,595		1,586
Total noninterest income		599		556		1,235		1,187
Total noninterest expense		983		947		1,968		1,871
Income (Loss) Before Income Taxes		427		417		862		902
Applicable income tax benefit		98		108		206		232
Net income (loss)		329		309		656		670
Less: Net income attributable to noncontrolling interests		(4)		(6)		(4)		(6)
Net income attributable to Bancorp		333		315		660		676
Dividends on preferred stock		23		23		38		38
Net income available to common shareholders		310		292		622		638
Total goodwill		2,416		2,416		2,416		2,416		$ 2,416
Total Assets		143,625	[1],[2]	141,628	[2]	143,625	[1],[2]	141,628	[2]	$ 141,048	[1]
Commercial Banking
Segment Reporting Information
Net interest income		460		402		911		794
Provision for loan and lease losses		72		37		137		77
Net interest income after provision for loan and lease losses		388		365		774		717
Total noninterest income		236	[3]	232	[4]	457	[5]	404	[6]
Total noninterest expense		355		348		716		696
Income (Loss) Before Income Taxes		269		249		515		425
Applicable income tax benefit		43		38		77		53
Net income (loss)		226		211		438		372
Net income attributable to Bancorp		226		211		438		372
Net income available to common shareholders		226		211		438		372
Total goodwill		613		613		613		613
Total Assets	[2]	60,042		58,688		60,042		58,688
Branch Banking
Segment Reporting Information
Net interest income		433		376		859		752
Provision for loan and lease losses		35		36		69		78
Net interest income after provision for loan and lease losses		398		340		790		674
Total noninterest income		214	[7]	94	[8]	401	[9]	270	[10]
Total noninterest expense		409		404		820		803
Income (Loss) Before Income Taxes		203		30		371		141
Applicable income tax benefit		71		11		131		50
Net income (loss)		132		19		240		91
Net income attributable to Bancorp		132		19		240		91
Net income available to common shareholders		132		19		240		91
Total goodwill		1,655		1,655		1,655		1,655
Total Assets	[2]	54,220		52,508		54,220		52,508
Consumer Lending
Segment Reporting Information
Net interest income		62		63		122		125
Provision for loan and lease losses		9		8		21		22
Net interest income after provision for loan and lease losses		53		55		101		103
Total noninterest income		80		122		164		251
Total noninterest expense		122		113		240		216
Income (Loss) Before Income Taxes		11		64		25		138
Applicable income tax benefit		4		23		9		49
Net income (loss)		7		41		16		89
Net income attributable to Bancorp		7		41		16		89
Net income available to common shareholders		7		41		16		89
Total Assets	[2]	22,598		22,534		22,598		22,534
Wealth and Asset Management
Segment Reporting Information
Net interest income		44		29		87		58
Provision for loan and lease losses		1		1		1		3
Net interest income after provision for loan and lease losses		43		28		86		55
Total noninterest income		100		103		202		212
Total noninterest expense		108		115		215		231
Income (Loss) Before Income Taxes		35		16		73		36
Applicable income tax benefit		12		6		25		12
Net income (loss)		23		10		48		24
Net income attributable to Bancorp		23		10		48		24
Net income available to common shareholders		23		10		48		24
Total goodwill		148		148		148		148
Total Assets	[2]	8,399		10,264		8,399		10,264
General Corporate and Other
Segment Reporting Information
Net interest income		(97)		17		(174)		5
Provision for loan and lease losses		(26)		(3)		(18)		(32)
Net interest income after provision for loan and lease losses		(71)		20		(156)		37
Total noninterest income		3		44		78		126
Total noninterest expense		23		6		44		1
Income (Loss) Before Income Taxes		(91)		58		(122)		162
Applicable income tax benefit		(32)		30		(36)		68
Net income (loss)		(59)		28		(86)		94
Less: Net income attributable to noncontrolling interests		(4)		(6)		(4)		(6)
Net income attributable to Bancorp		(55)		34		(82)		100
Dividends on preferred stock		23		23		38		38
Net income available to common shareholders		(78)		11		(120)		62
Total Assets	[2]	(1,634)	[11]	(2,366)	[12]	(1,634)	[11]	(2,366)	[12]
Intersegment Elimination
Segment Reporting Information
Total noninterest income		(34)	[13],[14]	(39)	[15],[16]	(67)	[13],[14]	(76)	[15],[16]
Total noninterest expense		$ (34)		$ (39)		$ (67)		$ (76)

[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 million 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 June 30, 2015 Condensed Consolidated Balance Sheet was adjusted to reflect the reclassification of $ 30 of debt issuance costs from other assets to long-term debt. For further information refer to Note 3 .

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

[4] Includes impairment charge s of $ 4 for operating lease equipment. For more information, refer to Note 20.

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

[6] Includes impairment charges of $ 34 for operating lease equipment. For more information refer to Note 20.

[7] Includes impairment charge s of $ 1 for branches and land. For more information refer to Note 7 and Note 20.

[8] Includes impairment charges of $ 98 for branches and land. For more information, refer to Note 7 and Note 20.

[9] Includes impairment charges of $ 3 for branches and land. For more information refer to Note 7 and Note 20.

[10] Includes impairment charge s of $ 1 02 for branches and land. For more information refer to Note 7 and Note 20.

[11] Includes bank premises and equipment of $ 52 classified as held for sale . For more information, refer to Note 7.

[12] Includes bank premises and equipment of $ 8 4 classified as held for sale. For more information, refer to Note 7.

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

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

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

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