Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information
Net interest income	$ 893		$ 903		$ 2,661		$ 2,696
Provision for loan and lease losses	51		65		176		227
Net interest income (loss) after provision for loan and lease losses	842		838		2,485		2,469
Noninterest income:
Mortgage banking net revenue	121		200		574		588
Service charges on deposits	140		128		407		387
Corporate banking revenue	102		101		307		299
Investment advisory revenue	97		92		295		281
Card and processing revenue	69		65		201		187
Other noninterest income	185		78		708		359
Securities gains, net	2		2		19		13
Securities gains, net - non-qualifying hedges on mortgage servicing rights	5		5		13		5
Total noninterest income	721		671		2,524		2,119
Noninterest expense:
Salaries, wages and incentives	389		399		1,193		1,191
Employee benefits	83		79		280		274
Net occupancy expense	75		76		230		227
Technology and communications	52		49		151		144
Card and processing expense	33		30		97		90
Equipment expense	29		28		85		82
Other noninterest expense	298		345		936		910
Total noninterest expense	959		1,006		2,972		2,918
Income (loss) before income taxes	604		503		2,037		1,670
Income Tax Expense (Benefit)	183		139		613		491
Net income (loss)	421		364		1,424		1,179
Less: Net income attributable to noncontrolling interests			(1)		9		(1)
Net income attributable to Bancorp	421		363		1,433		1,178
Dividends on preferred stock			9		18		26
Net income available to common shareholders	421		354		1,415		1,152
Total goodwill	2,416		2,417		2,416		2,417		2,416	2,417
Total Assets	125,673		117,483		125,673		117,483		121,894
Commercial Banking
Segment Reporting Information
Net interest income	374		354		1,095		1,049
Provision for loan and lease losses	37		45		116		181
Net interest income (loss) after provision for loan and lease losses	337		309		979		868
Noninterest income:
Service charges on deposits	61		57		179		166
Corporate banking revenue	98		96		295		286
Investment advisory revenue	1		1		4		5
Card and processing revenue	13		11		39		35
Other noninterest income	32		18		72		45
Total noninterest income	205		183		589		537
Noninterest expense:
Salaries, wages and incentives	55		53		174		166
Employee benefits	8		7		33		32
Net occupancy expense	6		5		17		16
Technology and communications	3		3		8		7
Card and processing expense	2		1		6		3
Equipment expense	1		1		3		2
Other noninterest expense	212		201		603		603
Total noninterest expense	287		271		844		829
Income (loss) before income taxes	255		221		724		576
Income Tax Expense (Benefit)	49		39		133		90
Net income (loss)	206		182		591		486
Net income attributable to Bancorp	206		182		591		486
Net income available to common shareholders	206		182		591		486
Total goodwill	613		613		613		613		613	613
Total Assets	50,438		47,495		50,438		47,495
Branch Banking
Segment Reporting Information
Net interest income	374		344		1,079		1,021
Provision for loan and lease losses	52		71		162		226
Net interest income (loss) after provision for loan and lease losses	322		273		917		795
Noninterest income:
Mortgage banking net revenue	3		3		10		10
Service charges on deposits	78		70		226		219
Corporate banking revenue	4		4		10		11
Investment advisory revenue	36		33		110		96
Card and processing revenue	74		72		215		202
Other noninterest income	22		21		65		60
Total noninterest income	217		203		636		598
Noninterest expense:
Salaries, wages and incentives	114		111		342		337
Employee benefits	32		31		100		98
Net occupancy expense	46		47		139		140
Technology and communications	1		1		3		3
Card and processing expense	31		29		91		86
Equipment expense	15		14		43		40
Other noninterest expense	191		172		557		496
Total noninterest expense	430		405		1,275		1,200
Income (loss) before income taxes	109		71		278		193
Income Tax Expense (Benefit)	38		25		98		68
Net income (loss)	71		46		180		125
Net income attributable to Bancorp	71		46		180		125
Net income available to common shareholders	71		46		180		125
Total goodwill	1,655		1,656		1,655		1,656		1,655	1,656
Total Assets	49,282		48,003		49,282		48,003
Consumer Lending
Segment Reporting Information
Net interest income	76		77		246		234
Provision for loan and lease losses	20		38		71		140
Net interest income (loss) after provision for loan and lease losses	56		39		175		94
Noninterest income:
Mortgage banking net revenue	118		197		563		577
Other noninterest income	11		10		37		30
Securities gains, net	2				2
Securities gains, net - non-qualifying hedges on mortgage servicing rights	5		5		13		5
Total noninterest income	136		212		615		612
Noninterest expense:
Salaries, wages and incentives	40		49		148		139
Employee benefits	9		9		34		30
Net occupancy expense	2		2		6		6
Technology and communications					1		1
Equipment expense					1		1
Other noninterest expense	117		107		366		319
Total noninterest expense	168		167		556		496
Income (loss) before income taxes	24		84		234		210
Income Tax Expense (Benefit)	9		30		83		74
Net income (loss)	15		54		151		136
Net income attributable to Bancorp	15		54		151		136
Net income available to common shareholders	15		54		151		136
Total Assets	23,015		23,640		23,015		23,640
Investment Advisors
Segment Reporting Information
Net interest income	38		30		109		87
Provision for loan and lease losses			3		1		9
Net interest income (loss) after provision for loan and lease losses	38		27		108		78
Noninterest income:
Mortgage banking net revenue					1		1
Service charges on deposits	1		1		2		2
Corporate banking revenue	1		1		2		2
Investment advisory revenue	95		90		289		275
Card and processing revenue	1		1		3		3
Other noninterest income	1		14		8		19
Total noninterest income	99		107		305		302
Noninterest expense:
Salaries, wages and incentives	33		33		100		103
Employee benefits	6		6		20		20
Net occupancy expense	2		3		7		8
Equipment expense							1
Other noninterest expense	66		67		217		199
Total noninterest expense	107		109		344		331
Income (loss) before income taxes	30		25		69		49
Income Tax Expense (Benefit)	10		9		24		17
Net income (loss)	20		16		45		32
Net income attributable to Bancorp	20		16		45		32
Net income available to common shareholders	20		16		45		32
Total goodwill	148		148		148		148		148	148
Total Assets	9,182		8,024		9,182		8,024
General Corporate and Other
Segment Reporting Information
Net interest income	31		98		132		305
Provision for loan and lease losses	(58)		(92)		(174)		(329)
Net interest income (loss) after provision for loan and lease losses	89		190		306		634
Noninterest income:
Corporate banking revenue	(1)
Card and processing revenue	(19)		(19)		(56)		(53)
Other noninterest income	119		15		526		205
Securities gains, net			2		17		13
Total noninterest income	99		(2)		487		165
Noninterest expense:
Salaries, wages and incentives	147		153		429		446
Employee benefits	28		26		93		94
Net occupancy expense	19		19		61		57
Technology and communications	48		45		139		133
Card and processing expense							1
Equipment expense	13		13		38		38
Other noninterest expense	(253)		(170)		(699)		(612)
Total noninterest expense	2		86		61		157
Income (loss) before income taxes	186		102		732		642
Income Tax Expense (Benefit)	77		36		275		242
Net income (loss)	109		66		457		400
Less: Net income attributable to noncontrolling interests			(1)		9		(1)
Net income attributable to Bancorp	109		65		466		399
Dividends on preferred stock			9		18		26
Net income available to common shareholders	109		56		448		373
Total Assets	(6,244)		(9,679)		(6,244)		(9,679)
Intersegment Elimination
Noninterest income:
Investment advisory revenue	(35)	[1]	(32)	[1]	(108)	[1]	(95)	[1]
Total noninterest income	(35)		(32)		(108)		(95)
Noninterest expense:
Other noninterest expense	(35)		(32)		(108)		(95)
Total noninterest expense	$ (35)		$ (32)		$ (108)		$ (95)

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