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Fair Value of Financial Instruments (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Carrying and fair values of financial instruments  
Held-to-maturity debt securities$ 26,458$ 427
Deposits1,041,3531,010,430
Long-term debt398,965448,431
Carrying Value [Member]
  
Carrying and fair values of financial instruments  
Held-to-maturity debt securities26,458[1]427[1]
Loans876,199876,739
Deposits1,041,3531,010,430
Long-term debt398,965448,431
Fair Value [Member]
  
Carrying and fair values of financial instruments  
Held-to-maturity debt securities26,508[1]427[1]
Loans850,767861,695
Deposits1,041,8401,010,460
Long-term debt$ 367,723$ 441,672
[1]For more information on held-to-maturity debt securities, see Note 5 – Securities.