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Loans and Leases (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Mar. 31, 2011
Property Development Acquired-Credit-Impaired [Member]
Aggregate short-duration advances $ 3,840,000,000 $ 3,840,000,000   $ 2,630,000,000  
Aggregate of debt restructurings 284,000,000 284,000,000   307,000,000  
Loans or leases contractually past-due days   90      
Recorded investment of property         42,000,000
Property carried at cost         22,000,000
Allowance for loan losses, charge-offs $ 28,000,000 $ 47,000,000 $ 3,000,000   $ 19,000,000