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Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees New Markets Tax Credits (Details) (USD $)
12 Months Ended
Dec. 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 $ 285,500,000  
Net tax benefits to be received from the Fund 303,700,000  
Difference between equity contributions and total benefits received will be recognized over the life of the Fund as net tax benefits 18,200,000  
Future equity contributions [Abstract]    
2013 50,822,000  
2014 39,059,000  
2015 12,975,000  
2016 11,890,000  
2017 3,292,000  
Total 118,038,000  
Equity contributions with an imputed interest rate [Abstract]    
Principal payment schedule above: 118,038,000  
Less: unamortized discount 10,513,000  
Total 107,525,000  
Equity contributions - imputed interst rate 6.00%  
Equity contributions in next 12 months 50,800,000  
Tax benefits in excess of capital contributions 98,900,000  
Tax benefits not utilized $ 90,000,000  
Period (in years) over which gross investment amortization expense is recognized 10  
Remaining period (in years) of recognition of gross investment amortization expense 5