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Debt with Affiliated Companies (Details) (Affiliated Entity [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Affiliated Entity [Member]
   
Debt Instrument [Line Items]    
Other short-term debt $ 156 $ 28
Notes payable within one year 0 4
Notes payable after one year 364 340
Debt with affiliated companies $ 520 $ 372