Results of Operations and Average Assets by Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015		Dec. 31, 2015
Segment Reporting Information
Net interest income	$ 903		$ 847
Provision for loan and lease losses	119		69
Net interest income (loss) after provision for loan and lease losses	784		778
Total noninterest income	637		630
Total noninterest expense	986		923
Income (Loss) Before Income Taxes	435		485
Applicable income tax benefit	108		124
Net income (loss)	327		361
Net income attributable to Bancorp	327		361
Dividends on preferred stock	15		15
Net income available to common shareholders	312		346
Total goodwill	2,416		2,416		$ 2,416
Total Assets	142,430	[1]	140,437		$ 141,048	[1]
Commercial Banking
Segment Reporting Information
Net interest income	451		392
Provision for loan and lease losses	65		42
Net interest income (loss) after provision for loan and lease losses	386		350
Total noninterest income	223		174	[2]
Total noninterest expense	363		348
Income (Loss) Before Income Taxes	246		176
Applicable income tax benefit	35		13
Net income (loss)	211		163
Net income attributable to Bancorp	211		163
Net income available to common shareholders	211		163
Total goodwill	613		613
Total Assets	59,652		57,855
Branch Banking
Segment Reporting Information
Net interest income	426		377
Provision for loan and lease losses	34		42
Net interest income (loss) after provision for loan and lease losses	392		335
Total noninterest income	189	[3]	176	[4]
Total noninterest expense	411		400
Income (Loss) Before Income Taxes	170		111
Applicable income tax benefit	60		39
Net income (loss)	110		72
Net income attributable to Bancorp	110		72
Net income available to common shareholders	110		72
Total goodwill	1,655		1,655
Total Assets	54,528		53,295
Consumer Lending
Segment Reporting Information
Net interest income	60		63
Provision for loan and lease losses	12		14
Net interest income (loss) after provision for loan and lease losses	48		49
Total noninterest income	83		129
Total noninterest expense	118		105
Income (Loss) Before Income Taxes	13		73
Applicable income tax benefit	5		26
Net income (loss)	8		47
Net income attributable to Bancorp	8		47
Net income available to common shareholders	8		47
Total Assets	22,475		22,057
Investment Advisors
Segment Reporting Information
Net interest income	43		29
Provision for loan and lease losses			1
Net interest income (loss) after provision for loan and lease losses	43		28
Total noninterest income	100		107
Total noninterest expense	107		115
Income (Loss) Before Income Taxes	36		20
Applicable income tax benefit	13		7
Net income (loss)	23		13
Net income attributable to Bancorp	23		13
Net income available to common shareholders	23		13
Total goodwill	148		148
Total Assets	8,900		10,042
General Corporate and Other
Segment Reporting Information
Net interest income	(77)		(14)
Provision for loan and lease losses	8		(30)
Net interest income (loss) after provision for loan and lease losses	(85)		16
Total noninterest income	75		82
Total noninterest expense	20		(7)
Income (Loss) Before Income Taxes	(30)		105
Applicable income tax benefit	(5)		39
Net income (loss)	(25)		66
Net income attributable to Bancorp	(25)		66
Dividends on preferred stock	15		15
Net income available to common shareholders	(40)		51
Total Assets	(3,125)		(2,812)
Intersegment Elimination
Segment Reporting Information
Total noninterest income	(33)	[5]	(38)	[6]
Total noninterest expense	$ (33)		$ (38)

[1] Upon adoption of ASU 2015-03 on January 1, 2016, the December 31, 2015 Condensed Consolidated Balance Sheets were adjusted to reflect the reclassification of $34 million of debt issuance costs from other assets to long-term debt. For further information refer to Note 3.

[2] Includes an impairment charge of $30 for operating lease equipment. For more information, refer to Note 20.

[3] Includes an impairment charge of $2 for branches and land. For more information refer to Note 7 and Note 20.

[4] Includes an impairment charge of $4 for branches and land. For more information, refer to Note 7 and Note 20.

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

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