Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Net interest income	$ 3,579		$ 3,561		$ 3,595
Provision for loan and lease losses	315		229		303
Net interest income (loss) after provision for loan and lease losses	3,264		3,332		3,292
Noninterest Income:
Service charges on deposits	560		549		522
Corporate banking revenue	430		400		413
Investment advisory revenue	407		393		374
Mortgage banking net revenue	310		700		845
Card and processing revenue	295		272		253
Other noninterest income	450		879		574
Securities gains, net	21		21		15
Securities gains, net - non-qualifying hedges on mortgage servicing rights			13		3
Total noninterest income	2,473		3,227		2,999
Noninterest expense:
Salaries, wages and incentives	1,449		1,581		1,607
Employee benefits	334		357		371
Net occupancy expense	313		307		302
Technology and communications	212		204		196
Card and processing expense	141		134		121
Equipment expense	121		114		110
Other noninterest expense	1,139		1,264		1,374
Total noninterest expense	3,709		3,961		4,081
Income Before Income Taxes	2,028		2,598		2,210
Income Tax Expense (Benefit)	545		772		636
Net income (loss)	1,483		1,826		1,574
Less: Net income attributable to noncontrolling interests	2		(10)		(2)
Net income attributable to Bancorp	1,481		1,836		1,576
Dividends on preferred stock	67		37		35
Net income available to common shareholders	1,414		1,799		1,541
Total goodwill	2,416		2,416		2,416
Total Assets	138,706		130,443		121,894
Commercial Banking
Segment Reporting Information [Line Items]
Net interest income	1,652		1,592		1,533
Provision for loan and lease losses	235		194		249
Net interest income (loss) after provision for loan and lease losses	1,417		1,398		1,284
Noninterest Income:
Service charges on deposits	286		267		251
Corporate banking revenue	429		392		402
Investment advisory revenue	3		5		6
Card and processing revenue	64		60		54
Other noninterest income	105		94		61
Total noninterest income	887		818		774
Noninterest expense:
Salaries, wages and incentives	259		261		257
Employee benefits	47		49		47
Net occupancy expense	26		25		24
Technology and communications	10		11		10
Card and processing expense	8		8		5
Equipment expense	10		4		2
Other noninterest expense	959		877		842
Total noninterest expense	1,319		1,235		1,187
Income Before Income Taxes	985		981		871
Income Tax Expense (Benefit)	166		167		157
Net income (loss)	819		814		714
Net income attributable to Bancorp	819		814		714
Net income available to common shareholders	819		814		714
Total goodwill	613		613		613
Total Assets	56,871		55,081		51,392
Branch Banking
Segment Reporting Information [Line Items]
Net interest income	1,546		1,356		1,261
Provision for loan and lease losses	181		210		268
Net interest income (loss) after provision for loan and lease losses	1,365		1,146		993
Noninterest Income:
Service charges on deposits	272		279		268
Corporate banking revenue	4		7		8
Investment advisory revenue	152		148		129
Mortgage banking net revenue	5		12		14
Card and processing revenue	226		207		195
Other noninterest income	61	[1]	87	[2]	85	[3]
Total noninterest income	720		740		699
Noninterest expense:
Salaries, wages and incentives	421		429		420
Employee benefits	116		118		117
Net occupancy expense	187		183		184
Technology and communications	4		4		3
Card and processing expense	133		125		115
Equipment expense	59		58		54
Other noninterest expense	631		656		576
Total noninterest expense	1,551		1,573		1,469
Income Before Income Taxes	534		313		223
Income Tax Expense (Benefit)	188		109		79
Net income (loss)	346		204		144
Net income attributable to Bancorp	346		204		144
Net income available to common shareholders	346		204		144
Total goodwill	1,655		1,655		1,655
Total Assets	50,920		47,221		46,157
Consumer Lending
Segment Reporting Information [Line Items]
Net interest income	257		312		314
Provision for loan and lease losses	156		92		176
Net interest income (loss) after provision for loan and lease losses	101		220		138
Noninterest Income:
Mortgage banking net revenue	304		687		830
Other noninterest income	42		45		42
Securities gains, net			3		1
Securities gains, net - non-qualifying hedges on mortgage servicing rights			13		3
Total noninterest income	346		748		876
Noninterest expense:
Salaries, wages and incentives	95		175		192
Employee benefits	27		40		39
Net occupancy expense	8		8		8
Technology and communications	2		1		1
Equipment expense			1		1
Other noninterest expense	420		460		429
Total noninterest expense	552		685		670
Income Before Income Taxes	(105)		283		344
Income Tax Expense (Benefit)	(37)		100		121
Net income (loss)	(68)		183		223
Net income attributable to Bancorp	(68)		183		223
Net income available to common shareholders	(68)		183		223
Total Assets	22,554		22,610		24,657
Investment Advisors
Segment Reporting Information [Line Items]
Net interest income	121		154		117
Provision for loan and lease losses	3		2		10
Net interest income (loss) after provision for loan and lease losses	118		152		107
Noninterest Income:
Service charges on deposits	2		3		3
Corporate banking revenue	2		3		3
Investment advisory revenue	397		384		366
Mortgage banking net revenue	1		1		1
Card and processing revenue	5		5		4
Other noninterest income	3		10		19
Total noninterest income	410		406		396
Noninterest expense:
Salaries, wages and incentives	136		134		136
Employee benefits	26		25		25
Net occupancy expense	9		10		11
Equipment expense					1
Other noninterest expense	274		284		264
Total noninterest expense	445		453		437
Income Before Income Taxes	83		105		66
Income Tax Expense (Benefit)	29		37		23
Net income (loss)	54		68		43
Net income attributable to Bancorp	54		68		43
Net income available to common shareholders	54		68		43
Total goodwill	148		148		148
Total Assets	10,443		10,711		9,212
General Corporate and Other
Segment Reporting Information [Line Items]
Net interest income	3		147		370
Provision for loan and lease losses	(260)		(269)		(400)
Net interest income (loss) after provision for loan and lease losses	263		416		770
Noninterest Income:
Corporate banking revenue	(5)		(2)
Investment advisory revenue	1
Other noninterest income	239		643		367
Securities gains, net	21		18		14
Total noninterest income	256		659		381
Noninterest expense:
Salaries, wages and incentives	538		582		602
Employee benefits	118		125		143
Net occupancy expense	83		81		75
Technology and communications	196		188		182
Card and processing expense			1		1
Equipment expense	52		51		52
Other noninterest expense	(999)		(869)		(610)
Total noninterest expense	(12)		159		445
Income Before Income Taxes	531		916		706
Income Tax Expense (Benefit)	199		359		256
Net income (loss)	332		557		450
Less: Net income attributable to noncontrolling interests	2		(10)		(2)
Net income attributable to Bancorp	330		567		452
Dividends on preferred stock	67		37		35
Net income available to common shareholders	263		530		417
Total Assets	(2,082)		(5,180)		(9,524)
Intersegment Elimination
Noninterest Income:
Investment advisory revenue	(146)	[4]	(144)	[4]	(127)	[4]
Total noninterest income	(146)		(144)		(127)
Noninterest expense:
Other noninterest expense	(146)		(144)		(127)
Total noninterest expense	$ (146)		$ (144)		$ (127)

[1] Includes an impairment charge of $20 for branches and land. For more information refer to Note 7 and Note 27 of the Notes to Consolidated Financial Statements.

[2] Includes an impairment charge of $6 for branches and land

[3] Includes an impairment charge of $21 for branches and land

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