Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees Operating Lease, and New Markets Tax Credits (Details) (USD $)	3 Months Ended
	Mar. 31, 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]
Nine months ending December 31, 2012	58,089,000
2013	36,225,000
2014	22,927,000
2015	21,904,000
2016	7,584,000
Thereafter	13,224,000
Total	159,953,000
Equity contributions to be paid in twelve months	66,500,000
Equity contributions with an imputed interest rate [Abstract]
Principal payment schedule above:	159,953,000
Less: unamortized discount	17,195,000
Total	142,758,000
Tax benefits in excess of capital contributions	85,500,000
Tax benefits not utilized	$ 64,800,000
Period over which gross investment amortization expense is recognized	10 years
Remaining period of recognition of gross investment amortization expense	5 years