Common, Preferred, and Treasury Stock - Additional Information (Detail) (USD $)	12 Months Ended						12 Months Ended				12 Months Ended			12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009	Mar. 16, 2011	Dec. 31, 2009 Series G Preferred Stock	Dec. 31, 2011 Series G Preferred Stock	Dec. 31, 2010 Series G Preferred Stock	Dec. 31, 2008 Series G Preferred Stock	Dec. 31, 2011 Preferred stock Series F	Dec. 31, 2010 Preferred stock Series F	Dec. 31, 2008 Preferred stock Series F	Dec. 31, 2011 Warrants related to Preferred Stock, Series F	Dec. 31, 2008 Warrants related to Preferred Stock, Series F	Dec. 31, 2011 Depositary Shares [Member]
Preferred stock, liquidation preference								$ 25,000	$ 25,000	$ 25,000	$ 25,000	$ 25,000	$ 25,000
Preferred stock, convertible into shares of common stock										2,159.8272
Preferred stock, conversion price per share of common stock										$ 11.575
Preferred stock, shares authorized								16,450	16,451			136,320				4,112,750
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												$ 11.72
Warrants value as a percentage of the preferred stock investment															15.00%
Preferred Stock, Dividend Rate, Percentage For First Five Years													5.00%
Preferred Stock, Dividend Rate, Percentage For Subsequent 9 Years													9.00%
Preferred Stock, Value, Issued	398,000,000	[1]	3,654,000,000	[1]									3,200,000,000
Proceeds from issuance of the Series F preferred stock allocated to warrants			239,000,000			280,000,000									239,000,000
Effective yield for the first five years													6.70%
Common Stock, Value, Issued	2,051,000,000	[2]	1,779,000,000	[2]	1,000,000,000
Common stock issued, shares	121,428,572				158,000,000
Successful completion of at-the-market offering of common shares, average price per share	$ 14.00				$ 6.33
Number of shares of common stock shares offered in exchange for each set of 250 validly tendered and accepted							2,158.8272
Amount of cash offered in exchange for each set of 250 validly tendered and accepted depositary shares of its Series G convertible preferred stock							8,250
Number of sets of validly tendered and accepted depositary shares							250
Number of common shares issued in exchange for depositary shares					60,000,000
Cash paid in exchange for depositary shares					230,000,000
Shares retired upon receipt					7,000,000		27,849
Liquidation amount of depositary shares tendered					696,000,000
Tendered depositary shares, percent of aggregate liquidation amount					63.00%
Increase to retained earnings and net income available to common shareholders					35,000,000
Stock Issued During Period, Value, Conversion of Convertible Securities							441,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(96,000)		(58,000)		(11,000)
Forward sale agreement	959,821
Repurchase Of Warrants During Period Value	(280,000,000)													280,000,000
Accretion Of Preferred Stock And Dividends Declared											$ 153,000,000

[1] 317,680 shares of undesignated no par value preferred stock are authorized of which none had been issued; 5.0% cumulative Series F perpetual preferred stock with a $25,000 liquidation preference: 136,320 issued and outstanding at December 31, 2010, which were redeemed on February 2, 2011; 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, 2011, 16,451 issued and outstanding at December 31, 2010.

[2] Common shares: Stated value $2.22 per share; authorized 2,000,000,000; outstanding at December 31, 2011 – 919,804,436 (excludes 4,088,145 treasury shares) and December 31, 2010 – 796,272,522 (excludes 5,231,666 treasury shares).