Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net interest income	$ 903		$ 893		$ 2,697		$ 2,661
Provision for loan and lease losses	71		51		216		176
Net interest income (loss) after provision for loan and lease losses	832		842		2,481		2,485
Noninterest income:
Service charges on deposits	145		140		418		407
Corporate banking revenue	100		102		311		307
Investment advisory revenue	103		97		307		295
Mortgage banking net revenue	61		121		248		574
Card and processing revenue	75		69		218		201
Other noninterest income	33		185		300		708
Securities gains, net	3		2		18		19
Securities gains, net - non-qualifying hedges on mortgage servicing rights			5				13
Total noninterest income	520		721		1,820		2,524
Noninterest expense:
Salaries, wages and incentives	357		389		1,083		1,193
Employee benefits	75		83		255		280
Net occupancy expense	78		75		236		230
Technology and communications	53		52		158		151
Card and processing expense	37		33		104		97
Equipment expense	30		29		90		85
Other noninterest expense	258		298		866		936
Total noninterest expense	888		959		2,792		2,972
Income (Loss) Before Income Taxes	464		604		1,509		2,037
Applicable income tax benefit	124		183		411		613
Net income (loss)	340		421		1,098		1,424
Less: Net income attributable to noncontrolling interests					2		(9)
Net income attributable to Bancorp	340		421		1,096		1,433
Dividends on preferred stock	12				44		18
Net income available to common shareholders	328		421		1,052		1,415
Total goodwill	2,416		2,416		2,416		2,416		2,416	2,416
Total Assets	134,188		125,673		134,188		125,673		130,443
Commercial Banking
Segment Reporting Information [Line Items]
Net interest income	418		401		1,231		1,172
Provision for loan and lease losses	47		39		184		122
Net interest income (loss) after provision for loan and lease losses	371		362		1,047		1,050
Noninterest income:
Service charges on deposits	72		67		214		198
Corporate banking revenue	98		100		311		300
Investment advisory revenue	1		2		2		4
Card and processing revenue	16		16		48		46
Other noninterest income	31		31		72		71
Total noninterest income	218		216		647		619
Noninterest expense:
Salaries, wages and incentives	63		63		192		195
Employee benefits	10		11		38		40
Net occupancy expense	6		6		19		19
Technology and communications	2		4		8		8
Card and processing expense	2		3		6		6
Equipment expense	3		1		7		3
Other noninterest expense	236		226		716		640
Total noninterest expense	322		314		986		911
Income (Loss) Before Income Taxes	267		264		708		758
Applicable income tax benefit	50		48		114		130
Net income (loss)	217		216		594		628
Net income attributable to Bancorp	217		216		594		628
Net income available to common shareholders	217		216		594		628
Total goodwill	613		613		613		613
Total Assets	56,496		53,212		56,496		53,212
Branch Banking
Segment Reporting Information [Line Items]
Net interest income	389		347		1,152		1,002
Provision for loan and lease losses	50		50		142		156
Net interest income (loss) after provision for loan and lease losses	339		297		1,010		846
Noninterest income:
Service charges on deposits	73		72		202		207
Corporate banking revenue	2		2		3		5
Investment advisory revenue	40		35		115		110
Mortgage banking net revenue	1		3		3		10
Card and processing revenue	58		52		167		152
Other noninterest income	20		23		43	[1]	66
Total noninterest income	194		187		533		550
Noninterest expense:
Salaries, wages and incentives	106		106		316		321
Employee benefits	29		29		91		93
Net occupancy expense	47		46		140		137
Technology and communications	1		1		3		3
Card and processing expense	35		30		98		91
Equipment expense	15		15		45		43
Other noninterest expense	160		167		474		488
Total noninterest expense	393		394		1,167		1,176
Income (Loss) Before Income Taxes	140		90		376		220
Applicable income tax benefit	49		31		133		77
Net income (loss)	91		59		243		143
Net income attributable to Bancorp	91		59		243		143
Net income available to common shareholders	91		59		243		143
Total goodwill	1,655		1,655		1,655		1,655
Total Assets	49,552		46,359		49,552		46,359
Consumer Lending
Segment Reporting Information [Line Items]
Net interest income	64		76		193		246
Provision for loan and lease losses	17		20		55		71
Net interest income (loss) after provision for loan and lease losses	47		56		138		175
Noninterest income:
Mortgage banking net revenue	60		118		244		563
Other noninterest income	10		11		33		37
Securities gains, net			2				2
Securities gains, net - non-qualifying hedges on mortgage servicing rights			5				13
Total noninterest income	70		136		277		615
Noninterest expense:
Salaries, wages and incentives	23		40		74		148
Employee benefits	7		9		22		34
Net occupancy expense	2		2		6		6
Technology and communications	1				2		1
Equipment expense							1
Other noninterest expense	82		117		341		366
Total noninterest expense	115		168		445		556
Income (Loss) Before Income Taxes	2		24		(30)		234
Applicable income tax benefit	1		9		(11)		83
Net income (loss)	1		15		(19)		151
Net income attributable to Bancorp	1		15		(19)		151
Net income available to common shareholders	1		15		(19)		151
Total Assets	22,631		23,015		22,631		23,015
Investment Advisors
Segment Reporting Information [Line Items]
Net interest income	30		38		90		109
Provision for loan and lease losses	1				3		1
Net interest income (loss) after provision for loan and lease losses	29		38		87		108
Noninterest income:
Service charges on deposits			1		2		2
Corporate banking revenue			1		1		2
Investment advisory revenue	101		95		300		289
Mortgage banking net revenue					1		1
Card and processing revenue	1		1		3		3
Other noninterest income			1		1		8
Total noninterest income	102		99		308		305
Noninterest expense:
Salaries, wages and incentives	33		33		101		100
Employee benefits	6		6		21		20
Net occupancy expense	2		2		7		7
Other noninterest expense	70		66		204		217
Total noninterest expense	111		107		333		344
Income (Loss) Before Income Taxes	20		30		62		69
Applicable income tax benefit	7		10		22		24
Net income (loss)	13		20		40		45
Net income attributable to Bancorp	13		20		40		45
Net income available to common shareholders	13		20		40		45
Total goodwill	148		148		148		148
Total Assets	9,856		9,182		9,856		9,182
General Corporate and Other
Segment Reporting Information [Line Items]
Net interest income	2		31		31		132
Provision for loan and lease losses	(44)		(58)		(168)		(174)
Net interest income (loss) after provision for loan and lease losses	46		89		199		306
Noninterest income:
Corporate banking revenue			(1)		(4)
Investment advisory revenue	(1)
Other noninterest income	(28)		119		151		526
Securities gains, net	3				18		17
Total noninterest income	(26)		118		165		543
Noninterest expense:
Salaries, wages and incentives	132		147		400		429
Employee benefits	23		28		83		93
Net occupancy expense	21		19		64		61
Technology and communications	49		47		145		139
Equipment expense	12		13		38		38
Other noninterest expense	(252)		(243)		(759)		(667)
Total noninterest expense	(15)		11		(29)		93
Income (Loss) Before Income Taxes	35		196		393		756
Applicable income tax benefit	17		85		153		299
Net income (loss)	18		111		240		457
Less: Net income attributable to noncontrolling interests					2		(9)
Net income attributable to Bancorp	18		111		238		466
Dividends on preferred stock	12				44		18
Net income available to common shareholders	6		111		194		448
Total Assets	(4,347)		(6,095)		(4,347)		(6,095)
Intersegment Elimination
Noninterest income:
Investment advisory revenue	(38)	[2]	(35)	[2]	(110)	[2]	(108)	[2]
Total noninterest income	(38)		(35)		(110)		(108)
Noninterest expense:
Other noninterest expense	(38)		(35)		(110)		(108)
Total noninterest expense	$ (38)		$ (35)		$ (110)		$ (108)

[1] Includes an impairment charge of $18 for branches and land. For more information refer to Note 7 and Note 22 of the Notes to Condensed Consolidated Financial Statements.

[2] Revenue sharing agreements between Investment Advisors and Branch Banking are eliminated in the Condensed Consolidated Statements of Income. Includes an impairment charge of $18 for branches and land. For more information refer to Note 7 and Note 22 of the Notes to Condensed Consolidated Financial Statements.