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Debt with Affiliated Companies (Details) (Affiliated Entity [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Affiliated Entity [Member]
   
Debt Instrument [Line Items]    
Other short-term debt $ 10 $ 27
Notes payable within one year 100 4
Notes payable after one year 231 307
Debt with affiliated companies $ 341 $ 338