Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Segment Reporting Information
Net interest income	$ 893		$ 888
Provision for loan and lease losses	69		62
Net interest income (loss) after provision for loan and lease losses	824		826
Noninterest income:
Service charges on deposits	133		131
Mortgage banking net revenue	109		220
Corporate banking revenue	104		99
Investment advisory revenue	102		100
Card and processing revenue	68		65
Other noninterest income	41		109
Securities gains, net	7		17
Securities gains, net - non-qualifying hedges on mortgage servicing rights			2
Total noninterest income	564		743
Noninterest expense:
Salaries, wages and incentives	359		399
Employee benefits	101		114
Net occupancy expense	80		79
Technology and communications	53		49
Card and processing expense	31		31
Equipment expense	30		28
Other noninterest expense	296		278
Total noninterest expense	950		978
Income (loss) before income taxes	438		591
Income Tax Expense (Benefit)	119		179
Net income (loss)	319		412
Less: Net income attributable to noncontrolling interests	(1)		10
Net income attributable to Bancorp	318		422
Dividends on preferred stock	9		9
Net income available to common shareholders	309		413
Total goodwill	2,416		2,416		2,416
Total Assets	129,654		121,382		130,443
Commercial Banking
Segment Reporting Information
Net interest income	404		384
Provision for loan and lease losses	97		44
Net interest income (loss) after provision for loan and lease losses	307		340
Noninterest income:
Service charges on deposits	69		65
Corporate banking revenue	104		97
Investment advisory revenue	1		1
Card and processing revenue	16		15
Other noninterest income	20		16
Total noninterest income	210		194
Noninterest expense:
Salaries, wages and incentives	64		70
Employee benefits	19		20
Net occupancy expense	6		6
Technology and communications	3		3
Card and processing expense	2		1
Equipment expense	2		1
Other noninterest expense	238		199
Total noninterest expense	334		300
Income (loss) before income taxes	183		234
Income Tax Expense (Benefit)	19		36
Net income (loss)	164		198
Net income attributable to Bancorp	164		198
Net income available to common shareholders	164		198
Total goodwill	613		613
Total Assets	55,676		52,117
Branch Banking
Segment Reporting Information
Net interest income	385		323
Provision for loan and lease losses	45		57
Net interest income (loss) after provision for loan and lease losses	340		266
Noninterest income:
Service charges on deposits	63		65
Mortgage banking net revenue	1		4
Corporate banking revenue	1		1
Investment advisory revenue	36		37
Card and processing revenue	51		49
Other noninterest income	20		22
Total noninterest income	172		178
Noninterest expense:
Salaries, wages and incentives	105		109
Employee benefits	35		36
Net occupancy expense	46		46
Technology and communications	2		1
Card and processing expense	29		29
Equipment expense	15		14
Other noninterest expense	158		155
Total noninterest expense	390		390
Income (loss) before income taxes	122		54
Income Tax Expense (Benefit)	42		20
Net income (loss)	80		34
Net income attributable to Bancorp	80		34
Net income available to common shareholders	80		34
Total goodwill	1,655		1,655
Total Assets	48,888		47,527
Consumer Lending
Segment Reporting Information
Net interest income	64		85
Provision for loan and lease losses	25		29
Net interest income (loss) after provision for loan and lease losses	39		56
Noninterest income:
Mortgage banking net revenue	108		216
Other noninterest income	10		11
Securities gains, net - non-qualifying hedges on mortgage servicing rights			2
Total noninterest income	118		229
Noninterest expense:
Salaries, wages and incentives	25		50
Employee benefits	9		13
Net occupancy expense	2		2
Other noninterest expense	130		112
Total noninterest expense	166		177
Income (loss) before income taxes	(9)		108
Income Tax Expense (Benefit)	(3)		38
Net income (loss)	(6)		70
Net income attributable to Bancorp	(6)		70
Net income available to common shareholders	(6)		70
Total Assets	22,436		24,026
Investment Advisors
Segment Reporting Information
Net interest income	32		36
Provision for loan and lease losses			1
Net interest income (loss) after provision for loan and lease losses	32		35
Noninterest income:
Service charges on deposits	1		1
Corporate banking revenue	1		1
Investment advisory revenue	100		98
Card and processing revenue	1		1
Other noninterest income			7
Total noninterest income	103		108
Noninterest expense:
Salaries, wages and incentives	34		33
Employee benefits	9		9
Net occupancy expense	2		3
Other noninterest expense	65		70
Total noninterest expense	110		115
Income (loss) before income taxes	25		28
Income Tax Expense (Benefit)	8		10
Net income (loss)	17		18
Net income attributable to Bancorp	17		18
Net income available to common shareholders	17		18
Total goodwill	148		148
Total Assets	9,775		9,114
General Corporate and Other
Segment Reporting Information
Net interest income	8		60
Provision for loan and lease losses	(98)		(69)
Net interest income (loss) after provision for loan and lease losses	106		129
Noninterest income:
Corporate banking revenue	(2)
Other noninterest income	(9)		53
Securities gains, net	7		17
Total noninterest income	(4)		70
Noninterest expense:
Salaries, wages and incentives	131		137
Employee benefits	29		36
Net occupancy expense	24		22
Technology and communications	48		45
Card and processing expense			1
Equipment expense	13		13
Other noninterest expense	(260)		(222)
Total noninterest expense	(15)		32
Income (loss) before income taxes	117		167
Income Tax Expense (Benefit)	53		75
Net income (loss)	64		92
Less: Net income attributable to noncontrolling interests	(1)		10
Net income attributable to Bancorp	63		102
Dividends on preferred stock	9		9
Net income available to common shareholders	54		93
Total Assets	(7,121)		(11,402)
Intersegment Elimination
Noninterest income:
Investment advisory revenue	(35)	[1]	(36)	[1]
Total noninterest income	(35)		(36)
Noninterest expense:
Other noninterest expense	(35)		(36)
Total noninterest expense	$ (35)		$ (36)

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