Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012
Segment Reporting Information
Net interest income	$ 888		$ 898
Provision for loan and lease losses	62		91
Net interest income (loss) after provision for loan and lease losses	826		807
Noninterest income:
Mortgage banking net revenue	220		204
Service charges on deposits	131		129
Corporate banking revenue	99		97
Investment advisory revenue	100		96
Card and processing revenue	65		59
Other noninterest income	109		175
Securities gains, net	17		9
Securities gains, net - non-qualifying hedges on mortgage servicing rights	2
Total noninterest income	743		769
Noninterest expense:
Salaries, wages and incentives	399		399
Employee benefits	114		112
Net occupancy expense	79		77
Technology and communications	49		47
Card and processing expense	31		30
Equipment expense	28		27
Other noninterest expense	278		281
Total noninterest expense	978		973
Income (loss) before income taxes	591		603
Income Tax Expense (Benefit)	179		173
Net income (loss)	412		430
Less: Net income attributable to noncontrolling interests	10
Net income attributable to Bancorp	422		430
Dividends on preferred stock	9		9
Net income available to common shareholders	413		421
Total goodwill	2,416		2,417		2,416
Total Assets	121,382		116,747		121,894
Commercial Banking
Segment Reporting Information
Net interest income	360		348
Provision for loan and lease losses	43		76
Net interest income (loss) after provision for loan and lease losses	317		272
Noninterest income:
Service charges on deposits	59		54
Corporate banking revenue	95		93
Investment advisory revenue	1		2
Card and processing revenue	13		12
Other noninterest income	16		16
Total noninterest income	184		177
Noninterest expense:
Salaries, wages and incentives	63		58
Employee benefits	17		16
Net occupancy expense	6		5
Technology and communications	3		2
Card and processing expense	1		1
Equipment expense	1		1
Other noninterest expense	186		205
Total noninterest expense	277		288
Income (loss) before income taxes	224		161
Income Tax Expense (Benefit)	39		19
Net income (loss)	185		142
Net income attributable to Bancorp	185		142
Net income available to common shareholders	185		142
Total goodwill	613		613
Total Assets	49,428		46,388
Branch Banking
Segment Reporting Information
Net interest income	347		335
Provision for loan and lease losses	58		86
Net interest income (loss) after provision for loan and lease losses	289		249
Noninterest income:
Mortgage banking net revenue	4		3
Service charges on deposits	71		74
Corporate banking revenue	3		3
Investment advisory revenue	37		31
Card and processing revenue	68		60
Other noninterest income	22		19
Total noninterest income	205		190
Noninterest expense:
Salaries, wages and incentives	116		112
Employee benefits	39		37
Net occupancy expense	46		47
Technology and communications	1		1
Card and processing expense	29		28
Equipment expense	14		13
Other noninterest expense	178		156
Total noninterest expense	423		394
Income (loss) before income taxes	71		45
Income Tax Expense (Benefit)	26		16
Net income (loss)	45		29
Net income attributable to Bancorp	45		29
Net income available to common shareholders	45		29
Total goodwill	1,655		1,656
Total Assets	50,174		48,544
Consumer Lending
Segment Reporting Information
Net interest income	85		80
Provision for loan and lease losses	29		54
Net interest income (loss) after provision for loan and lease losses	56		26
Noninterest income:
Mortgage banking net revenue	216		201
Other noninterest income	11		10
Securities gains, net - non-qualifying hedges on mortgage servicing rights	2
Total noninterest income	229		211
Noninterest expense:
Salaries, wages and incentives	50		44
Employee benefits	13		12
Net occupancy expense	2		2
Other noninterest expense	112		104
Total noninterest expense	177		162
Income (loss) before income taxes	108		75
Income Tax Expense (Benefit)	38		27
Net income (loss)	70		48
Net income attributable to Bancorp	70		48
Net income available to common shareholders	70		48
Total Assets	24,026		23,155
Investment Advisors
Segment Reporting Information
Net interest income	36		27
Provision for loan and lease losses	1		3
Net interest income (loss) after provision for loan and lease losses	35		24
Noninterest income:
Service charges on deposits	1		1
Corporate banking revenue	1		1
Investment advisory revenue	98		94
Card and processing revenue	1		1
Other noninterest income	7
Total noninterest income	108		97
Noninterest expense:
Salaries, wages and incentives	33		35
Employee benefits	9		9
Net occupancy expense	3		3
Other noninterest expense	70		63
Total noninterest expense	115		110
Income (loss) before income taxes	28		11
Income Tax Expense (Benefit)	10		4
Net income (loss)	18		7
Net income attributable to Bancorp	18		7
Net income available to common shareholders	18		7
Total goodwill	148		148
Total Assets	9,114		7,684
General Corporate and Other
Segment Reporting Information
Net interest income	60		108
Provision for loan and lease losses	(69)		(128)
Net interest income (loss) after provision for loan and lease losses	129		236
Noninterest income:
Card and processing revenue	(17)		(14)
Other noninterest income	53		130
Securities gains, net	17		9
Total noninterest income	53		125
Noninterest expense:
Salaries, wages and incentives	137		150
Employee benefits	36		38
Net occupancy expense	22		20
Technology and communications	45		44
Card and processing expense	1		1
Equipment expense	13		13
Other noninterest expense	(232)		(216)
Total noninterest expense	22		50
Income (loss) before income taxes	160		311
Income Tax Expense (Benefit)	66		107
Net income (loss)	94		204
Less: Net income attributable to noncontrolling interests	10
Net income attributable to Bancorp	104		204
Dividends on preferred stock	9		9
Net income available to common shareholders	95		195
Total Assets	(11,360)		(9,024)
Intersegment Elimination
Noninterest income:
Investment advisory revenue	(36)	[1]	(31)	[1]
Total noninterest income	(36)	[1]	(31)	[1]
Noninterest expense:
Other noninterest expense	(36)	[1]	(31)	[1]
Total noninterest expense	$ (36)	[1]	$ (31)	[1]

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