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Related Party Transactions Related Party Transactions - Receivables From Related Parties (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]    
Current receivables from related parties $ 3 $ 2
Centennial
   
Related Party Transaction [Line Items]    
Current receivables from related parties 1 1
TAME
   
Related Party Transaction [Line Items]    
Current receivables from related parties $ 2 $ 1