Results of Operations and Average Assets by Segment (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014		Dec. 31, 2014
Segment Reporting Information [Line Items]
Net interest income	$ 887		$ 900		$ 1,734		$ 1,793
Provision for loan and lease losses	79		76		148		146
Net interest income (loss) after provision for loan and lease losses	808		824		1,586		1,647
Total noninterest income	556		736		1,187		1,300
Total noninterest expense	947		954		1,871		1,903
Income (Loss) Before Income Taxes	417		606		902		1,044
Applicable income tax benefit	108		167		232		287
Net income (loss)	309		439		670		757
Less: Net income attributable to noncontrolling interests	(6)				(6)		1
Net income attributable to Bancorp	315		439		676		756
Dividends on preferred stock	23		23		38		32
Net income available to common shareholders	292		416		638		724
Total goodwill	2,416		2,416		2,416		2,416		$ 2,416
Total Assets	141,658		132,562		141,658		132,562		$ 138,706
Commercial Banking
Segment Reporting Information [Line Items]
Net interest income	402		403		794		801
Provision for loan and lease losses	38		40		71		139
Net interest income (loss) after provision for loan and lease losses	364		363		723		662
Total noninterest income	232	[1]	216		404	[2]	425
Total noninterest expense	356		330		713		663
Income (Loss) Before Income Taxes	240		249		414		424
Applicable income tax benefit	34		41		46		58
Net income (loss)	206		208		368		366
Net income attributable to Bancorp	206		208		368		366
Net income available to common shareholders	206		208		368		366
Total goodwill	613		613		613		613
Total Assets	58,695		56,001		58,695		56,001
Branch Banking
Segment Reporting Information [Line Items]
Net interest income	376		384		752		775
Provision for loan and lease losses	38		47		81		91
Net interest income (loss) after provision for loan and lease losses	338		337		671		684
Total noninterest income	94	[3]	171	[4]	270	[5]	343	[6]
Total noninterest expense	396		385		787		775
Income (Loss) Before Income Taxes	36		123		154		252
Applicable income tax benefit	13		43		55		89
Net income (loss)	23		80		99		163
Net income attributable to Bancorp	23		80		99		163
Net income available to common shareholders	23		80		99		163
Total goodwill	1,655		1,655		1,655		1,655
Total Assets	52,497		49,764		52,497		49,764
Consumer Lending
Segment Reporting Information [Line Items]
Net interest income	63		65		125		129
Provision for loan and lease losses	8		13		22		38
Net interest income (loss) after provision for loan and lease losses	55		52		103		91
Total noninterest income	122		90		251		209
Total noninterest expense	112		165		214		330
Income (Loss) Before Income Taxes	65		(23)		140		(30)
Applicable income tax benefit	23		(8)		49		(11)
Net income (loss)	42		(15)		91		(19)
Net income attributable to Bancorp	42		(15)		91		(19)
Net income available to common shareholders	42		(15)		91		(19)
Total Assets	22,534		22,365		22,534		22,365
Investment Advisors
Segment Reporting Information [Line Items]
Net interest income	29		29		58		60
Provision for loan and lease losses	2		1		3		2
Net interest income (loss) after provision for loan and lease losses	27		28		55		58
Total noninterest income	103		101		212		205
Total noninterest expense	115		111		231		222
Income (Loss) Before Income Taxes	15		18		36		41
Applicable income tax benefit	6		6		13		14
Net income (loss)	9		12		23		27
Net income attributable to Bancorp	9		12		23		27
Net income available to common shareholders	9		12		23		27
Total goodwill	148		148		148		148
Total Assets	10,264		9,251		10,264		9,251
General Corporate and Other
Segment Reporting Information [Line Items]
Net interest income	17		19		5		28
Provision for loan and lease losses	(7)		(25)		(29)		(124)
Net interest income (loss) after provision for loan and lease losses	24		44		34		152
Total noninterest income	44		196		126		190
Total noninterest expense	7		1		2		(15)
Income (Loss) Before Income Taxes	61		239		158		357
Applicable income tax benefit	32		85		69		137
Net income (loss)	29		154		89		220
Less: Net income attributable to noncontrolling interests	(6)				(6)		1
Net income attributable to Bancorp	35		154		95		219
Dividends on preferred stock	23		23		38		32
Net income available to common shareholders	12		131		57		187
Total Assets	(2,332)		(4,819)		(2,332)		(4,819)
Intersegment Elimination
Segment Reporting Information [Line Items]
Total noninterest income	(39)	[7]	(38)	[8]	(76)	[9]	(72)	[10]
Total noninterest expense	$ (39)		$ (38)		$ (76)		$ (72)

[1] Includes an impairment charge of $4 for operating lease equipment. For more information refer to Note 8 and Note 20.

[2] Includes an impairment charge of $34 for operating lease equipment. For more information refer to Note 8 and Note 20

[3] Includes an impairment charge of $98 for branches and land. For more information refer to Note 7 and Note 20.

[4] Includes an impairment charge of $18 for branches and land. For more information refer to Note 7 and Note 20.

[5] Includes an impairment charge of $102 for branches and land. For more information refer to Note 7 and Note 20.

[6] Includes an impairment charge of $18 for branches and land. For more information refer to Note 7 and Note 20.

[7] Revenue sharing agreements between Investment Advisors and Branch Banking are eliminated in the Condensed Consolidated Statements of Income.

[8] Revenue sharing agreements between Investment Advisors and Branch Banking are eliminated in the Condensed Consolidated Statements of Income.

[9] Revenue sharing agreements between Investment Advisors and Branch Banking are eliminated in the Condensed Consolidated Statements of Income.

[10] Revenue sharing agreements between Investment Advisors and Branch Banking are eliminated in the Condensed Consolidated Statements of Income.