Restrictions on Cash and Dividends - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Preferred stock Series F	Dec. 31, 2008 Preferred stock Series F
Restricted Cash and Cash Equivalents Items [Line Items]
Dividends paid by the Bancorp's state chartered bank	$ 2,000,000,000	$ 2,000,000,000
Dividend Received From Nonbank Companies And Related Subsidiaries	2,000,000,000	1,700,000,000
Issuance of senior preferred stock and related warrants				3,400,000,000
Banking Subsidiary Reserve Requirement	1,500,000,000	1,100,000,000
Subsidiary Deposit To FRB	1,100,000,000	265,000,000
Redemption of preferred shares			136,320
Redemption of preferred shares, value		(3,408,000,000)	3,400,000,000
Minimum Tier 1 Common Ratio	5.00%
Stock repurchase authorization amount	$ 600,000,000