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Long-Term Debt (Details 1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Summary showing division of total long term debt    
Unsecured obligations $ 1,070 $ 840
Obligations secured by real estate 64 64
Other secured borrowings 24 30
Long-term Debt $ 1,158 $ 934