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Property and Equipment, net Property and Equipment, net - Tangible Impairment Assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Tangible asset impairment charges $ 0us-gaap_TangibleAssetImpairmentCharges $ 72us-gaap_TangibleAssetImpairmentCharges
Continuing Operations [Member]    
Tangible asset impairment charges 0us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember		 4us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentContinuingOperationsMember
Discontinued Operations [Member]    
Tangible asset impairment charges $ 0us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember		 $ 68us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember