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Shareholders' Equity (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Regulatory capital ratios    
Total risk-based capital $ 29,173 $ 25,947
Tier 1 capital Minimum 4.00%  
Tier 1 capital Well Capitalized 6.00%  
Total risk-based capital Minimum 8.00%  
Total risk-based capital Well Capitalized 10.00%  
Leverage Minimum 4.00%  
Leverage Well Capitalized 5.00%  
Total U.S. Bancorp [Member]
   
Regulatory capital ratios    
Tier one capital 29,173 25,947
As a percent of risk-weighted assets 10.80% 10.50%
As a percent of adjusted quarterly average assets (leverage ratio) 9.10% 9.10%
Total risk-based capital $ 36,067 $ 33,033
As a percent of risk-weighted assets 13.30% 13.30%
US Bank National Association [Member]
   
Regulatory capital ratios    
Tier 1 capital 9.60% 9.00%
Total risk-based capital, percentage 12.50% 12.40%
Leverage 8.10% 7.70%
US Bank National Association ND [Member]
   
Regulatory capital ratios    
Tier 1 capital 13.40% 14.10%
Total risk-based capital, percentage 16.40% 17.20%
Leverage 12.90% 13.70%