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Composition of Certain Financial Statement Captions - Schedule of Other Current Assets (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Balance Sheet Related Disclosures [Abstract]    
Inventory $ 6 [1] $ 6 [1]
Prepaid assets 11 11
Short-term deferred financing costs 1 0
Total $ 18 $ 17
[1] Inventory represents costs incurred in excess of billings.