Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Segment Reporting Information
Net interest income	$ 900		$ 880		$ 1,793		$ 1,768
Provision for loan and lease losses	76		64		146		126
Net interest income (loss) after provision for loan and lease losses	824		816		1,647		1,642
Noninterest income:
Service charges on deposits	139		136		272		267
Corporate banking revenue	107		106		211		205
Investment advisory revenue	102		98		204		198
Mortgage banking net revenue	78		233		187		453
Card and processing revenue	76		67		144		132
Other noninterest income	226		414		268		523
Securities gains, net	8				14		17
Securities gains, net - non-qualifying hedges on mortgage servicing rights			6				8
Total noninterest income	736		1,060		1,300		1,803
Noninterest expense:
Salaries, wages and incentives	368		404		727		803
Employee benefits	79		83		180		197
Net occupancy expense	79		76		158		155
Technology and communications	52		50		105		99
Card and processing expense	37		33		68		65
Equipment expense	30		28		60		56
Other noninterest expense	309		361		605		638
Total noninterest expense	954		1,035		1,903		2,013
Income (loss) before income taxes	606		841		1,044		1,432
Income Tax Expense (Benefit)	167		250		287		429
Net income (loss)	439		591		757		1,003
Less: Net income attributable to noncontrolling interests					(1)		10
Net income attributable to Bancorp	439		591		756		1,013
Dividends on preferred stock	23		9		32		18
Net income available to common shareholders	416		582		724		995
Total goodwill	2,416		2,416		2,416		2,416		2,416
Total Assets	132,562		123,360		132,562		123,360		130,443
Commercial Banking
Segment Reporting Information
Net interest income	409		387		814		772
Provision for loan and lease losses	40		39		139		84
Net interest income (loss) after provision for loan and lease losses	369		348		675		688
Noninterest income:
Service charges on deposits	71		65		141		131
Corporate banking revenue	108		103		212		201
Investment advisory revenue	1		2		2		2
Card and processing revenue	17		15		34		30
Other noninterest income	22		25		41		39
Total noninterest income	219		210		430		403
Noninterest expense:
Salaries, wages and incentives	65		63		129		133
Employee benefits	10		10		28		30
Net occupancy expense	6		6		13		12
Technology and communications	3		2		5		5
Card and processing expense	3		2		5		4
Equipment expense	2		1		4		1
Other noninterest expense	241		217		479		414
Total noninterest expense	330		301		663		599
Income (loss) before income taxes	258		257		442		492
Income Tax Expense (Benefit)	44		44		64		80
Net income (loss)	214		213		378		412
Net income attributable to Bancorp	214		213		378		412
Net income available to common shareholders	214		213		378		412
Total goodwill	613		613		613		613
Total Assets	56,591		53,232		56,591		53,232
Branch Banking
Segment Reporting Information
Net interest income	377		332		762		655
Provision for loan and lease losses	47		49		91		106
Net interest income (loss) after provision for loan and lease losses	330		283		671		549
Noninterest income:
Service charges on deposits	67		70		130		135
Corporate banking revenue	1		2		2		3
Investment advisory revenue	39		37		75		74
Mortgage banking net revenue	2		3		2		7
Card and processing revenue	58		51		108		100
Other noninterest income	3	[1]	22		22	[1]	44
Total noninterest income	170		185		339		363
Noninterest expense:
Salaries, wages and incentives	105		106		210		215
Employee benefits	27		28		62		64
Net occupancy expense	47		46		93		92
Technology and communications	1		1		2		2
Card and processing expense	34		32		63		61
Equipment expense	15		14		30		29
Other noninterest expense	155		166		313		321
Total noninterest expense	384		393		773		784
Income (loss) before income taxes	116		75		237		128
Income Tax Expense (Benefit)	41		27		83		46
Net income (loss)	75		48		154		82
Net income attributable to Bancorp	75		48		154		82
Net income available to common shareholders	75		48		154		82
Total goodwill	1,655		1,655		1,655		1,655
Total Assets	49,185		47,077		49,185		47,077
Consumer Lending
Segment Reporting Information
Net interest income	65		85		129		170
Provision for loan and lease losses	13		22		38		51
Net interest income (loss) after provision for loan and lease losses	52		63		91		119
Noninterest income:
Mortgage banking net revenue	76		230		184		445
Other noninterest income	13		14		23		26
Securities gains, net - non-qualifying hedges on mortgage servicing rights			6				8
Total noninterest income	89		250		207		479
Noninterest expense:
Salaries, wages and incentives	26		57		50		107
Employee benefits	6		11		16		24
Net occupancy expense	2		2		4		4
Technology and communications	1				1
Equipment expense							1
Other noninterest expense	129		138		260		249
Total noninterest expense	164		208		331		385
Income (loss) before income taxes	(23)		105		(33)		213
Income Tax Expense (Benefit)	(8)		38		(11)		75
Net income (loss)	(15)		67		(22)		138
Net income attributable to Bancorp	(15)		67		(22)		138
Net income available to common shareholders	(15)		67		(22)		138
Total Assets	22,352		23,973		22,352		23,973
Investment Advisors
Segment Reporting Information
Net interest income	29		35		60		70
Provision for loan and lease losses	1		1		2		2
Net interest income (loss) after provision for loan and lease losses	28		34		58		68
Noninterest income:
Service charges on deposits	1		1		1		1
Corporate banking revenue			1		1		1
Investment advisory revenue	99		96		199		194
Mortgage banking net revenue					1		1
Card and processing revenue	1		1		2		2
Other noninterest income					1		7
Total noninterest income	101		99		205		206
Noninterest expense:
Salaries, wages and incentives	34		34		68		67
Employee benefits	6		6		15		15
Net occupancy expense	2		2		5		5
Other noninterest expense	69		81		134		151
Total noninterest expense	111		123		222		238
Income (loss) before income taxes	18		10		41		36
Income Tax Expense (Benefit)	6		3		14		13
Net income (loss)	12		7		27		23
Net income attributable to Bancorp	12		7		27		23
Net income available to common shareholders	12		7		27		23
Total goodwill	148		148		148		148
Total Assets	9,251		8,480		9,251		8,480
General Corporate and Other
Segment Reporting Information
Net interest income	20		41		28		101
Provision for loan and lease losses	(25)		(47)		(124)		(117)
Net interest income (loss) after provision for loan and lease losses	45		88		152		218
Noninterest income:
Corporate banking revenue	(2)				(4)
Investment advisory revenue	1
Other noninterest income	188		353		181		407
Securities gains, net	8				14		17
Total noninterest income	195		353		191		424
Noninterest expense:
Salaries, wages and incentives	138		144		270		281
Employee benefits	30		28		59		64
Net occupancy expense	22		20		43		42
Technology and communications	47		47		97		92
Card and processing expense			(1)
Equipment expense	13		13		26		25
Other noninterest expense	(247)		(204)		(509)		(425)
Total noninterest expense	3		47		(14)		79
Income (loss) before income taxes	237		394		357		563
Income Tax Expense (Benefit)	84		138		137		215
Net income (loss)	153		256		220		348
Less: Net income attributable to noncontrolling interests					(1)		10
Net income attributable to Bancorp	153		256		219		358
Dividends on preferred stock	23		9		32		18
Net income available to common shareholders	130		247		187		340
Total Assets	(4,817)		(9,402)		(4,817)		(9,402)
Intersegment Elimination
Noninterest income:
Investment advisory revenue	(38)	[2]	(37)	[2]	(72)	[2]	(72)	[2]
Total noninterest income	(38)		(37)		(72)		(72)
Noninterest expense:
Other noninterest expense	(38)		(37)		(72)		(72)
Total noninterest expense	$ (38)		$ (37)		$ (72)		$ (72)

[1] Includes an impairment charge of $18 for branches and land. For more information refer to Note 7 and Note 21 of the Notes to Condensed Consolidated Financial Statements.

[2] Revenue sharing agreements between Investment Advisors and Branch Banking are eliminated in the Condensed Consolidated Statements of Income. Includes an impairment charge of $18 for branches and land. For more information refer to Note 7 and Note 21 of the Notes to Condensed Consolidated Financial Statements.