Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees Operating Lease, and New Markets Tax Credits (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Aug. 31, 2008
New Markets Tax Credits [Abstract]
Membership interest in U.S Bank New Markets Tax Credit Fund (in hundredths)			99.90%
Equity contributions to be made to the Fund		$ 286,300,000
Net tax benefits to be received from the Fund		304,600,000
Difference between equity contributions and total benefits received will be recognized over the life of the Fund as net tax benefits		18,300,000
Future equity contributions [Abstract]
Six months ending December 31, 2012	28,319,000	28,319,000
2013	48,777,000	48,777,000
2014	37,525,000	37,525,000
2015	13,998,000	13,998,000
2016	12,530,000	12,530,000
2017	5,211,000	5,211,000
Total	146,360,000	146,360,000
Equity contributions to be paid in twelve months	51,300,000	51,300,000
Equity contributions with an imputed interest rate [Abstract]
Principal payment schedule above:	146,360,000	146,360,000
Less: unamortized discount	14,775,000	14,775,000
Total	131,585,000	131,585,000
Tax benefits in excess of capital contributions		96,400,000
Tax benefits not utilized	$ 77,200,000	$ 77,200,000
Period over which gross investment amortization expense is recognized	10 years
Remaining period of recognition of gross investment amortization expense	5 years