Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012
Segment Reporting Information
Net interest income	$ 880		$ 895		$ 1,768		$ 1,793
Provision for loan and lease losses	64		71		126		162
Net interest income (loss) after provision for loan and lease losses	816		824		1,642		1,631
Noninterest income:
Mortgage banking net revenue	233		183		453		387
Service charges on deposits	136		130		267		260
Corporate banking revenue	106		102		205		199
Investment advisory revenue	98		93		198		190
Card and processing revenue	67		64		132		122
Other noninterest income	414		103		523		279
Securities gains, net			3		17		11
Securities gains, net - non-qualifying hedges on mortgage servicing rights	6				8
Total noninterest income	1,060		678		1,803		1,448
Noninterest expense:
Salaries, wages and incentives	404		393		803		792
Employee benefits	83		84		197		195
Net occupancy expense	76		74		155		151
Technology and communications	50		48		99		95
Card and processing expense	33		30		65		60
Equipment expense	28		27		56		55
Other noninterest expense	361		281		638		563
Total noninterest expense	1,035		937		2,013		1,911
Income (loss) before income taxes	841		565		1,432		1,168
Income Tax Expense (Benefit)	250		180		429		352
Net income (loss)	591		385		1,003		816
Less: Net income attributable to noncontrolling interests					10		(1)
Net income attributable to Bancorp	591		385		1,013		815
Dividends on preferred stock	9		9		18		18
Net income available to common shareholders	582		376		995		797
Total goodwill	2,416		2,417		2,416		2,417		2,416
Total Assets	123,360		117,543		123,360		117,543		121,894
Commercial Banking
Segment Reporting Information
Net interest income	361		348		722		696
Provision for loan and lease losses	37		61		80		137
Net interest income (loss) after provision for loan and lease losses	324		287		642		559
Noninterest income:
Service charges on deposits	59		54		118		109
Corporate banking revenue	102		97		197		190
Investment advisory revenue	1		2		2		4
Card and processing revenue	13		12		26		23
Other noninterest income	23		12		40		28
Total noninterest income	198		177		383		354
Noninterest expense:
Salaries, wages and incentives	56		56		119		113
Employee benefits	8		9		25		24
Net occupancy expense	6		5		11		11
Technology and communications	2		2		5		4
Card and processing expense	2		1		4		2
Equipment expense	1				1		1
Other noninterest expense	204		196		390		402
Total noninterest expense	279		269		555		557
Income (loss) before income taxes	243		195		470		356
Income Tax Expense (Benefit)	45		32		84		51
Net income (loss)	198		163		386		305
Net income attributable to Bancorp	198		163		386		305
Net income available to common shareholders	198		163		386		305
Total goodwill	613		613		613		613
Total Assets	50,441		46,691		50,441		46,691
Branch Banking
Segment Reporting Information
Net interest income	358		342		705		677
Provision for loan and lease losses	51		69		109		155
Net interest income (loss) after provision for loan and lease losses	307		273		596		522
Noninterest income:
Mortgage banking net revenue	3		4		7		6
Service charges on deposits	76		75		148		149
Corporate banking revenue	3		4		7		7
Investment advisory revenue	37		32		74		64
Card and processing revenue	74		70		142		130
Other noninterest income	23		20		43		39
Total noninterest income	216		205		421		395
Noninterest expense:
Salaries, wages and incentives	113		113		228		226
Employee benefits	30		30		69		67
Net occupancy expense	46		47		93		93
Technology and communications	2		1		2		2
Card and processing expense	32		29		61		57
Equipment expense	14		13		29		26
Other noninterest expense	189		168		367		324
Total noninterest expense	426		401		849		795
Income (loss) before income taxes	97		77		168		122
Income Tax Expense (Benefit)	35		27		59		43
Net income (loss)	62		50		109		79
Net income attributable to Bancorp	62		50		109		79
Net income available to common shareholders	62		50		109		79
Total goodwill	1,655		1,656		1,655		1,656
Total Assets	49,843		48,156		49,843		48,156
Consumer Lending
Segment Reporting Information
Net interest income	85		77		170		157
Provision for loan and lease losses	22		49		51		103
Net interest income (loss) after provision for loan and lease losses	63		28		119		54
Noninterest income:
Mortgage banking net revenue	230		179		445		380
Other noninterest income	14		10		26		20
Securities gains, net - non-qualifying hedges on mortgage servicing rights	6				8
Total noninterest income	250		189		479		400
Noninterest expense:
Salaries, wages and incentives	57		47		107		91
Employee benefits	11		9		24		21
Net occupancy expense	2		2		4		4
Equipment expense					1
Other noninterest expense	138		108		249		213
Total noninterest expense	208		166		385		329
Income (loss) before income taxes	105		51		213		125
Income Tax Expense (Benefit)	38		18		75		44
Net income (loss)	67		33		138		81
Net income attributable to Bancorp	67		33		138		81
Net income available to common shareholders	67		33		138		81
Total Assets	23,973		23,538		23,973		23,538
Investment Advisors
Segment Reporting Information
Net interest income	35		29		70		57
Provision for loan and lease losses	1		2		2		6
Net interest income (loss) after provision for loan and lease losses	34		27		68		51
Noninterest income:
Mortgage banking net revenue					1		1
Service charges on deposits	1		1		1		2
Corporate banking revenue	1		1		1		2
Investment advisory revenue	96		91		194		185
Card and processing revenue	1		1		2		2
Other noninterest income			4		7		4
Total noninterest income	99		98		206		196
Noninterest expense:
Salaries, wages and incentives	34		35		67		69
Employee benefits	6		6		15		15
Net occupancy expense	2		3		5		6
Other noninterest expense	81		68		151		132
Total noninterest expense	123		112		238		222
Income (loss) before income taxes	10		13		36		25
Income Tax Expense (Benefit)	3		5		13		9
Net income (loss)	7		8		23		16
Net income attributable to Bancorp	7		8		23		16
Net income available to common shareholders	7		8		23		16
Total goodwill	148		148		148		148
Total Assets	8,480		7,721		8,480		7,721
General Corporate and Other
Segment Reporting Information
Net interest income	41		99		101		206
Provision for loan and lease losses	(47)		(110)		(116)		(239)
Net interest income (loss) after provision for loan and lease losses	88		209		217		445
Noninterest income:
Investment advisory revenue	1						1
Card and processing revenue	(21)		(19)		(38)		(33)
Other noninterest income	354		57		407		188
Securities gains, net			3		17		11
Total noninterest income	334		41		386		167
Noninterest expense:
Salaries, wages and incentives	144		142		282		293
Employee benefits	28		30		64		68
Net occupancy expense	20		17		42		37
Technology and communications	46		45		92		89
Card and processing expense	(1)						1
Equipment expense	13		14		25		28
Other noninterest expense	(214)		(227)		(447)		(444)
Total noninterest expense	36		21		58		72
Income (loss) before income taxes	386		229		545		540
Income Tax Expense (Benefit)	129		98		198		205
Net income (loss)	257		131		347		335
Less: Net income attributable to noncontrolling interests					10		(1)
Net income attributable to Bancorp	257		131		357		334
Dividends on preferred stock	9		9		18		18
Net income available to common shareholders	248		122		339		316
Total Assets	(9,377)		(8,563)		(9,377)		(8,563)
Intersegment Elimination
Noninterest income:
Investment advisory revenue	(37)	[1]	(32)	[1]	(72)	[1]	(64)	[1]
Total noninterest income	(37)		(32)		(72)		(64)
Noninterest expense:
Other noninterest expense	(37)		(32)		(72)		(64)
Total noninterest expense	$ (37)		$ (32)		$ (72)		$ (64)

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