Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees Operating Lease, and New Markets Tax Credits (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	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]
2012	76,629,000
2013	36,225,000
2014	22,927,000
2015	21,904,000
2016	7,584,000
Thereafter	13,224,000
Total	178,493,000
Equity contributions with an imputed interest rate [Abstract]
Principal payment schedule above:	178,493,000
Less: unamortized discount	19,579,000
Total	158,914,000
Imputed interest rate (in hundredths)	6.00%
Tax benefits in excess of capital contributions	84,000,000
Tax benefits not utilized	$ 54,500,000
Period over which gross investment amortization expense is recognized	10 years
Remaining period of recognition of gross investment amortization expense	7 years