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Property and Equipment, Net - Components of Property and Equipment (Parenthetical) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property Plant And Equipment [Line Items]    
Capitalization of construction in-process related to build to suit lease obligation $ 52us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid $ 8us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid
Other Noncurrent Liabilities    
Property Plant And Equipment [Line Items]    
Capitalization of construction in-process related to build to suit lease obligation 52us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		 8us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
Other Noncurrent Assets    
Property Plant And Equipment [Line Items]    
Normal and structural tenant improvements $ 26us-gaap_TenantImprovements
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember