Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	$ 3,595		$ 3,557		$ 3,604
Provision for loan and lease losses	303		423		1,538
Net interest income (loss) after provision for loan and lease losses	3,292		3,134		2,066
Noninterest income:
Mortgage banking net revenue	845		597		647
Service charges on deposits	522		520		574
Corporate banking revenue	413		350		364
Investment advisory revenue	374		375		361
Card and processing revenue	253		308		316
Other noninterest income	574		250		406
Securities gains, net	15		46		47
Securities gains, net - non-qualifying hedges on mortgage servicing rights	3		9		14
Total noninterest income	2,999		2,455		2,729
Noninterest expense:
Salaries, wages and incentives	1,607		1,478		1,430
Employee benefits	371		330		314
Net occupancy expense	302		305		298
Technology and communications	196		188		189
Card and processing expense	121		120		108
Equipment expense	110		113		122
Other noninterest expense	1,374		1,224		1,394
Total noninterest expense	4,081		3,758		3,855
Income (loss) before income taxes	2,210		1,831		940
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	636		533		187
Net income (loss)	1,574		1,298		753
Less: Net income attributable to noncontrolling interests	2		(1)
Net income attributable to Bancorp	1,576		1,297		753
Dividends on preferred stock	35		203		250
Net income available to common shareholders	1,541		1,094		503
Total goodwill	2,416		2,417		2,417
Total Assets	121,894		116,967		111,007
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	1,432		1,357		1,531
Provision for loan and lease losses	223		490		1,159
Net interest income (loss) after provision for loan and lease losses	1,209		867		372
Noninterest income:
Service charges on deposits	225		207		199
Corporate banking revenue	395		332		346
Investment advisory revenue	6		12		15
Card and processing revenue	46		38		33
Other noninterest income	65		52		42
Total noninterest income	737		641		635
Noninterest expense:
Salaries, wages and incentives	229		203		182
Employee benefits	39		37		32
Net occupancy expense	21		20		16
Technology and communications	10		11		14
Card and processing expense	5		5		2
Equipment expense	2		2		2
Other noninterest expense	800		795		723
Total noninterest expense	1,106		1,073		971
Income (loss) before income taxes	840		435		36
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	146		(6)		(142)
Net income (loss)	694		441		178
Net income attributable to Bancorp	694		441		178
Net income available to common shareholders	694		441		178
Total goodwill	613		613		613
Total Assets	48,693		45,864		43,609
Branch Banking [Member]
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	1,362		1,423		1,514
Provision for loan and lease losses	294		393		555
Net interest income (loss) after provision for loan and lease losses	1,068		1,030		959
Noninterest income:
Mortgage banking net revenue	14		11		27
Service charges on deposits	294		309		369
Corporate banking revenue	15		14		15
Investment advisory revenue	129		117		106
Card and processing revenue	279		305		298
Other noninterest income	81		81		70
Total noninterest income	812		837		885
Noninterest expense:
Salaries, wages and incentives	448		454		439
Employee benefits	125		127		121
Net occupancy expense	187		184		174
Technology and communications	3		5		16
Card and processing expense	115		114		105
Equipment expense	54		51		49
Other noninterest expense	660		640		652
Total noninterest expense	1,592		1,575		1,556
Income (loss) before income taxes	288		292		288
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	102		102		103
Net income (loss)	186		190		185
Net income attributable to Bancorp	186		190		185
Net income available to common shareholders	186		190		185
Total goodwill	1,655		1,656		1,656
Total Assets	48,856		46,703		46,244
Consumer Lending [Member]
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	314		343		405
Provision for loan and lease losses	176		261		569
Net interest income (loss) after provision for loan and lease losses	138		82		(164)
Noninterest income:
Mortgage banking net revenue	830		585		619
Service charges on deposits					1
Other noninterest income	42		36		36
Securities gains, net	1
Securities gains, net - non-qualifying hedges on mortgage servicing rights	3		9		14
Total noninterest income	876		630		670
Noninterest expense:
Salaries, wages and incentives	192		149		163
Employee benefits	39		34		31
Net occupancy expense	8		8		7
Technology and communications	1		1		2
Equipment expense	1		1		1
Other noninterest expense	429		433		342
Total noninterest expense	670		626		546
Income (loss) before income taxes	344		86		(40)
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	121		30		(14)
Net income (loss)	223		56		(26)
Net income attributable to Bancorp	223		56		(26)
Net income available to common shareholders	223		56		(26)
Total Assets	24,657		24,325		22,604
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	117		113		138
Provision for loan and lease losses	10		27		44
Net interest income (loss) after provision for loan and lease losses	107		86		94
Noninterest income:
Mortgage banking net revenue	1		1		2
Service charges on deposits	3		4		6
Corporate banking revenue	3		3		3
Investment advisory revenue	366		364		346
Card and processing revenue	4		4		1
Other noninterest income	19		(3)		(2)
Total noninterest income	396		373		356
Noninterest expense:
Salaries, wages and incentives	136		138		131
Employee benefits	25		26		25
Net occupancy expense	11		11		9
Technology and communications			1		2
Equipment expense	1		1		1
Other noninterest expense	264		244		237
Total noninterest expense	437		421		405
Income (loss) before income taxes	66		38		45
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	23		14		16
Net income (loss)	43		24		29
Net income attributable to Bancorp	43		24		29
Net income available to common shareholders	43		24		29
Total goodwill	148		148		148
Total Assets	9,212		7,670		6,759
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Interest Revenue Expense Net	370		321		16
Provision for loan and lease losses	(400)		(748)		(789)
Net interest income (loss) after provision for loan and lease losses	770		1,069		805
Noninterest income:
Mortgage banking net revenue					(1)
Service charges on deposits					(1)
Corporate banking revenue			1
Investment advisory revenue			(1)
Card and processing revenue	(76)		(39)		(16)
Other noninterest income	367		84		260
Securities gains, net	14		46		47
Total noninterest income	305		91		289
Noninterest expense:
Salaries, wages and incentives	602		534		515
Employee benefits	143		106		105
Net occupancy expense	75		82		92
Technology and communications	182		170		155
Card and processing expense	1		1		1
Equipment expense	52		58		69
Other noninterest expense	(652)		(771)		(454)
Total noninterest expense	403		180		483
Income (loss) before income taxes	672		980		611
Income Tax Expense Benefit Including Fully Taxable Equivalent Adjustment	244		393		224
Net income (loss)	428		587		387
Less: Net income attributable to noncontrolling interests	2		(1)
Net income attributable to Bancorp	430		586		387
Dividends on preferred stock	35		203		250
Net income available to common shareholders	395		383		137
Total Assets	(9,524)		(7,595)		(8,209)
Intersegment Elimination [Member]
Noninterest income:
Investment advisory revenue	(127)	[1]	(117)	[1]	(106)	[1]
Total noninterest income	(127)	[1]	(117)	[1]	(106)	[1]
Noninterest expense:
Other noninterest expense	(127)	[1]	(117)	[1]	(106)	[1]
Total noninterest expense	$ (127)	[1]	$ (117)	[1]	$ (106)	[1]

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