Annual report pursuant to Section 13 and 15(d)

Assets And Liabilities Measured At Fair Value (Details)

v2.4.1.9
Assets And Liabilities Measured At Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short term marketable securities $ 199us-gaap_MarketableSecuritiesCurrent $ 15us-gaap_MarketableSecuritiesCurrent
Estimate of Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 507us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
859us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Short term marketable securities 199us-gaap_MarketableSecuritiesCurrent
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
15us-gaap_MarketableSecuritiesCurrent
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Available-for-sale securities 769us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,293us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Financial instrument assets 305us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
397us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Debt 990us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,002us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 507us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
859us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Short term marketable securities   15us-gaap_MarketableSecuritiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Available-for-sale securities 691us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
978us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Financial instrument assets 96us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short term marketable securities 199us-gaap_MarketableSecuritiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Available-for-sale securities 78us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
315us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Financial instrument assets 209us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
397us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Debt $ 990us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
$ 1,002us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member