Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	$ 3,561		$ 3,595		$ 3,557
Provision for loan and lease losses	229		303		423
Net interest income (loss) after provision for loan and lease losses	3,332		3,292		3,134
Noninterest Income:
Mortgage banking net revenue	700		845		597
Service charges on deposits	549		522		520
Corporate banking revenue	400		413		350
Investment advisory revenue	393		374		375
Card and processing revenue	272		253		308
Other noninterest income	879		574		250
Securities gains, net	21		15		46
Securities gains, net - non-qualifying hedges on mortgage servicing rights	13		3		9
Total noninterest income	3,227		2,999		2,455
Noninterest expense:
Salaries, wages and incentives	1,581		1,607		1,478
Employee benefits	357		371		330
Net occupancy expense	307		302		305
Technology and communications	204		196		188
Card and processing expense	134		121		120
Equipment expense	114		110		113
Other noninterest expense	1,264		1,374		1,224
Total noninterest expense	3,961		4,081		3,758
Income (loss) before income taxes	2,598		2,210		1,831
Income Tax Expense (Benefit)	772		636		533
Net income (loss)	1,826		1,574		1,298
Less: Net income attributable to noncontrolling interests	10		2		(1)
Net income attributable to Bancorp	1,836		1,576		1,297
Dividends on preferred stock	37		35		203
Net income available to common shareholders	1,799		1,541		1,094
Total goodwill	2,416		2,416		2,417
Total Assets	130,443		121,894		116,967
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	1,487		1,432		1,357
Provision for loan and lease losses	187		223		490
Net interest income (loss) after provision for loan and lease losses	1,300		1,209		867
Noninterest Income:
Service charges on deposits	242		225		207
Corporate banking revenue	386		395		332
Investment advisory revenue	5		6		12
Card and processing revenue	52		46		38
Other noninterest income	95		65		52
Total noninterest income	780		737		641
Noninterest expense:
Salaries, wages and incentives	233		229		203
Employee benefits	40		39		37
Net occupancy expense	23		21		20
Technology and communications	11		10		11
Card and processing expense	7		5		5
Equipment expense	4		2		2
Other noninterest expense	825		800		795
Total noninterest expense	1,143		1,106		1,073
Income (loss) before income taxes	937		840		435
Income Tax Expense (Benefit)	171		146		(6)
Net income (loss)	766		694		441
Net income attributable to Bancorp	766		694		441
Net income available to common shareholders	766		694		441
Total goodwill	613		613		613
Total Assets	52,287		48,693		45,864
Branch Banking [Member]
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	1,461		1,362		1,423
Provision for loan and lease losses	217		294		393
Net interest income (loss) after provision for loan and lease losses	1,244		1,068		1,030
Noninterest Income:
Mortgage banking net revenue	12		14		11
Service charges on deposits	304		294		309
Corporate banking revenue	13		15		14
Investment advisory revenue	148		129		117
Card and processing revenue	291		279		305
Other noninterest income	86		81		81
Total noninterest income	854		812		837
Noninterest expense:
Salaries, wages and incentives	457		448		454
Employee benefits	127		125		127
Net occupancy expense	185		187		184
Technology and communications	4		3		5
Card and processing expense	126		115		114
Equipment expense	58		54		51
Other noninterest expense	748		660		640
Total noninterest expense	1,705		1,592		1,575
Income (loss) before income taxes	393		288		292
Income Tax Expense (Benefit)	138		102		102
Net income (loss)	255		186		190
Net income attributable to Bancorp	255		186		190
Net income available to common shareholders	255		186		190
Total goodwill	1,655		1,655		1,656
Total Assets	50,038		48,856		46,703
Consumer Lending [Member]
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	312		314		343
Provision for loan and lease losses	92		176		261
Net interest income (loss) after provision for loan and lease losses	220		138		82
Noninterest Income:
Mortgage banking net revenue	687		830		585
Other noninterest income	45		42		36
Securities gains, net	3		1
Securities gains, net - non-qualifying hedges on mortgage servicing rights	13		3		9
Total noninterest income	748		876		630
Noninterest expense:
Salaries, wages and incentives	175		192		149
Employee benefits	40		39		34
Net occupancy expense	8		8		8
Technology and communications	1		1		1
Equipment expense	1		1		1
Other noninterest expense	460		429		433
Total noninterest expense	685		670		626
Income (loss) before income taxes	283		344		86
Income Tax Expense (Benefit)	100		121		30
Net income (loss)	183		223		56
Net income attributable to Bancorp	183		223		56
Net income available to common shareholders	183		223		56
Total Assets	22,610		24,657		24,325
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	154		117		113
Provision for loan and lease losses	2		10		27
Net interest income (loss) after provision for loan and lease losses	152		107		86
Noninterest Income:
Mortgage banking net revenue	1		1		1
Service charges on deposits	3		3		4
Corporate banking revenue	3		3		3
Investment advisory revenue	384		366		364
Card and processing revenue	5		4		4
Other noninterest income	10		19		(3)
Total noninterest income	406		396		373
Noninterest expense:
Salaries, wages and incentives	134		136		138
Employee benefits	25		25		26
Net occupancy expense	10		11		11
Technology and communications					1
Equipment expense	0		1		1
Other noninterest expense	284		264		244
Total noninterest expense	453		437		421
Income (loss) before income taxes	105		66		38
Income Tax Expense (Benefit)	37		23		14
Net income (loss)	68		43		24
Net income attributable to Bancorp	68		43		24
Net income available to common shareholders	68		43		24
Total goodwill	148		148		148
Total Assets	10,711		9,212		7,670
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	147		370		321
Provision for loan and lease losses	(269)		(400)		(748)
Net interest income (loss) after provision for loan and lease losses	416		770		1,069
Noninterest Income:
Corporate banking revenue	(2)				1
Investment advisory revenue					(1)
Card and processing revenue	(76)		(76)		(39)
Other noninterest income	643		367		84
Securities gains, net	18		14		46
Total noninterest income	583		305		91
Noninterest expense:
Salaries, wages and incentives	582		602		534
Employee benefits	125		143		106
Net occupancy expense	81		75		82
Technology and communications	188		182		170
Card and processing expense	1		1		1
Equipment expense	51		52		58
Other noninterest expense	(909)		(652)		(771)
Total noninterest expense	119		403		180
Income (loss) before income taxes	880		672		980
Income Tax Expense (Benefit)	326		244		393
Net income (loss)	554		428		587
Less: Net income attributable to noncontrolling interests	10		2		(1)
Net income attributable to Bancorp	564		430		586
Dividends on preferred stock	37		35		203
Net income available to common shareholders	527		395		383
Total Assets	(5,203)		(9,524)		(7,595)
Intersegment Elimination [Member]
Noninterest Income:
Investment advisory revenue	(144)	[1]	(127)	[1]	(117)	[1]
Total noninterest income	(144)	[1]	(127)	[1]	(117)	[1]
Noninterest expense:
Other noninterest expense	(144)	[1]	(127)	[1]	(117)	[1]
Total noninterest expense	$ (144)	[1]	$ (127)	[1]	$ (117)	[1]

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