Results of Operations and Average Assets by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Segment Reporting Information [Line Items]
Net interest income	$ 847		$ 893
Provision for loan and lease losses	69		69
Net interest income (loss) after provision for loan and lease losses	778		824
Total noninterest income	630		564
Total noninterest expense	923		950
Income (Loss) Before Income Taxes	485		438
Applicable income tax benefit	124		119
Net income (loss)	361		319
Less: Net income attributable to noncontrolling interests			1
Net income attributable to Bancorp	361		318
Dividends on preferred stock	15		9
Net income available to common shareholders	346		309
Total goodwill	2,416		2,416		2,416
Total Assets	140,470		129,654		138,706
Commercial Banking
Segment Reporting Information [Line Items]
Net interest income	392		398
Provision for loan and lease losses	33		98
Net interest income (loss) after provision for loan and lease losses	359		300
Total noninterest income	174	[1]	208
Total noninterest expense	357		333
Income (Loss) Before Income Taxes	176		175
Applicable income tax benefit	13		17
Net income (loss)	163		158
Net income attributable to Bancorp	163		158
Net income available to common shareholders	163		158
Total goodwill	613		613
Total Assets	57,864		55,090
Branch Banking
Segment Reporting Information [Line Items]
Net interest income	377		391
Provision for loan and lease losses	42		45
Net interest income (loss) after provision for loan and lease losses	335		346
Total noninterest income	176	[2]	174
Total noninterest expense	392		390
Income (Loss) Before Income Taxes	119		130
Applicable income tax benefit	42		45
Net income (loss)	77		85
Net income attributable to Bancorp	77		85
Net income available to common shareholders	77		85
Total goodwill	1,655		1,655
Total Assets	53,290		49,469
Consumer Lending
Segment Reporting Information [Line Items]
Net interest income	63		64
Provision for loan and lease losses	14		25
Net interest income (loss) after provision for loan and lease losses	49		39
Total noninterest income	129		119
Total noninterest expense	104		167
Income (Loss) Before Income Taxes	74		(9)
Applicable income tax benefit	26		(3)
Net income (loss)	48		(6)
Net income attributable to Bancorp	48		(6)
Net income available to common shareholders	48		(6)
Total Assets	22,057		22,436
Investment Advisors
Segment Reporting Information [Line Items]
Net interest income	29		32
Provision for loan and lease losses	2
Net interest income (loss) after provision for loan and lease losses	27		32
Total noninterest income	107		103
Total noninterest expense	115		110
Income (Loss) Before Income Taxes	19		25
Applicable income tax benefit	7		8
Net income (loss)	12		17
Net income attributable to Bancorp	12		17
Net income available to common shareholders	12		17
Total goodwill	148		148
Total Assets	10,042		9,775
General Corporate and Other
Segment Reporting Information [Line Items]
Net interest income	(14)		8
Provision for loan and lease losses	(22)		(99)
Net interest income (loss) after provision for loan and lease losses	8		107
Total noninterest income	82		(5)
Total noninterest expense	(7)		(15)
Income (Loss) Before Income Taxes	97		117
Applicable income tax benefit	36		52
Net income (loss)	61		65
Less: Net income attributable to noncontrolling interests			1
Net income attributable to Bancorp	61		64
Dividends on preferred stock	15		9
Net income available to common shareholders	46		55
Total Assets	(2,783)		(7,116)
Intersegment Elimination
Segment Reporting Information [Line Items]
Total noninterest income	(38)	[3]	(35)	[3]
Total noninterest expense	$ (38)		$ (35)

[1] Includes an impairment charge of $30 for operating lease equipment. For more information refer to Note 8 and Note 19.

[2] Includes an impairment charge of $4 for branches and land. For more information refer to Note 7 and Note 19.

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