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Income taxes - Components of deferred income tax assets and liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets:    
Deferred loss and tax credit carryforwards $ 289us-gaap_DeferredTaxAssetsOtherLossCarryforwards $ 345us-gaap_DeferredTaxAssetsOtherLossCarryforwards
Accrued expenses 248us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 265us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Stock-based compensation 238us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 262us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Inventories and related reserves 157us-gaap_DeferredTaxAssetsInventory 162us-gaap_DeferredTaxAssetsInventory
Retirement costs for defined benefit and retiree health care 96us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 101us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Other 122us-gaap_DeferredTaxAssetsOther 148us-gaap_DeferredTaxAssetsOther
Deferred income tax assets, gross 1,150us-gaap_DeferredTaxAssetsGross 1,283us-gaap_DeferredTaxAssetsGross
Valuation allowance (195)us-gaap_DeferredTaxAssetsValuationAllowance (219)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred income tax assets, net 955us-gaap_DeferredTaxAssetsNet 1,064us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities:    
Acquisition-related intangibles and fair-value adjustments (688)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (804)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
International earnings (104)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings (121)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Property, plant and equipment (10)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (57)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other (37)us-gaap_DeferredTaxLiabilitiesOther (31)us-gaap_DeferredTaxLiabilitiesOther
Deferred income tax liabilities, net (839)us-gaap_DeferredTaxLiabilities (1,013)us-gaap_DeferredTaxLiabilities
Net deferred income tax asset $ 116us-gaap_DeferredTaxAssetsLiabilitiesNet $ 51us-gaap_DeferredTaxAssetsLiabilitiesNet