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Discontinued Cperations and Dispositions (Leveraged Leases) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Energy Holdings [Member]
   
Proceeds from Sale of Loans and Leases Held-for-investment $ 175  
Leveraged Leases [Member]
   
Proceeds from Sale of Loans and Leases Held-for-investment 175 433
Gain (Loss) on Sale of Loans and Leases $ 34 $ 30