Common, Preferred, and Treasury Stock - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended								1 Months Ended	12 Months Ended		0 Months Ended		1 Months Ended					1 Months Ended	4 Months Ended	5 Months Ended	8 Months Ended	10 Months Ended		12 Months Ended
	Jan. 25, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2012 Series G Preferred Stock	Dec. 31, 2011 Series G Preferred Stock	Dec. 31, 2008 Series G Preferred Stock	Feb. 02, 2011 Preferred stock Series F	Dec. 31, 2011 Preferred stock Series F	Dec. 31, 2008 Preferred stock Series F	Mar. 16, 2011 Warrant [Member]	Dec. 31, 2008 Warrant [Member]	Jan. 25, 2011 Common Stock	Feb. 04, 2011 Common Stock	Oct. 24, 2011 Common Stock	Dec. 31, 2012 Preferred Stock	Dec. 31, 2011 Preferred Stock	Feb. 13, 2013 Treasury Stock	Apr. 26, 2012 Treasury Stock	Jun. 01, 2012 Treasury Stock	Aug. 28, 2012 Treasury Stock	Oct. 24, 2012 Treasury Stock	Nov. 09, 2012 Treasury Stock	Dec. 19, 2012 Treasury Stock
Preferred stock, liquidation preference							$ 25,000	$ 25,000	$ 25,000			$ 25,000
Preferred stock, convertible into shares of common stock							2,159.8272	2,159.8272	2,159.8272
Preferred stock, conversion price per share of common stock									$ 11.575
Preferred stock, shares authorized							16,450	16,450		136,320								0	0
Preferred stock, shares reserved for issuance							1,700
Value of Series F shares purchased by U.S. Treasury												$ 3,400,000,000
Number of Series F shares purchased by U.S. Treasury												136,320
Warrants to purchase Bancorp's common stock														43,617,747
Warrants to purchase Bancorp's common stock, exercise price														$ 11.72
Warrants value as a percentage of the preferred stock investment												15.00%
Preferred Stock, Value, Issued		398,000,000	[1]	398,000,000	[1]							3,200,000,000
Proceeds from issuance of the Series F preferred stock allocated to warrants														239,000,000
Effective yield for the first five years												6.70%
Common Stock, Value, Issued		2,051,000,000	[2]	2,051,000,000	[2]										1,700,000,000
Successful completion of at-the-market offering of common shares, average price per share																	$ 14.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		(205,000)		(96,000)		(58,000)
Repurchase Of Warrants During Period Value				(280,000,000)									280,000,000
Accretion Of Preferred Stock And Dividends Declared										153,000,000	153,000,000
Stock redeemed or called during period, shares											136,320				121,428,572						4,838,710		21,531,100		7,710,761	6,267,410
Repurchase amount		(650,000,000)																			75,000,000		350,000,000		125,000,000	100,000,000
Incremental common shares																959,821				657,917		631,986		1,444,047
Repurchase Shares Authorized																							100
Remaining Repurchase Shares Authorized																							14
Redemption date	January 25, 2011																				April 26, 2012		August 28, 2012		November 9, 2012	December 19, 2012
Forward contract redemption date																February 4, 2011				February 12, 2013		June 1, 2012		October 24, 2012
Issuance of common stock to underwriters															12,142,857
Repurchase Of Common Shares Authorized Under CCAR																							$ 600,000,000

[1] 317,680 shares of undesignated no par value preferred stock are authorized of which none had been issued; 8.5% non-cumulative Series G convertible (into 2,159.8272 common shares) perpetual preferred stock with a $25,000 liquidation preference: 46,000 authorized, 16,450 issued and outstanding at December 31, 2012 and 2011.

[2] Common shares: Stated value $2.22 per share; authorized 2,000,000,000; outstanding at December 31, 2012 – 882,152,057 (excludes 41,740,524 treasury shares) and December 31, 2011 – 919,804,436 (excludes 4,088,145 treasury shares).