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Income Taxes - Significant Components of Deferred Tax Assets and Liability (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:      
Allowances and operating liabilities $ 542nov_DeferredTaxAssetsAllowancesAndOperatingLiabilities $ 439nov_DeferredTaxAssetsAllowancesAndOperatingLiabilities $ 368nov_DeferredTaxAssetsAllowancesAndOperatingLiabilities
Net operating loss carryforwards 118us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 51us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 25us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Postretirement benefits 79us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 49us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 54us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Foreign tax credit carryforwards 244us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 300us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 259us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Other 15us-gaap_DeferredTaxAssetsOther 39us-gaap_DeferredTaxAssetsOther 149us-gaap_DeferredTaxAssetsOther
Deferred tax assets gross 998us-gaap_DeferredTaxAssetsGross 878us-gaap_DeferredTaxAssetsGross 855us-gaap_DeferredTaxAssetsGross
Valuation allowance for deferred tax assets (48)us-gaap_DeferredTaxAssetsValuationAllowance (133)us-gaap_DeferredTaxAssetsValuationAllowance (93)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 950us-gaap_DeferredTaxAssetsNet 745us-gaap_DeferredTaxAssetsNet 762us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:      
Tax over book depreciation 236nov_DeferredTaxLiabilitiesTaxOverBookDepreciation 306nov_DeferredTaxLiabilitiesTaxOverBookDepreciation 268nov_DeferredTaxLiabilitiesTaxOverBookDepreciation
Intangible assets 1,304us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 1,757us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 1,448us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred income 257us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome 285us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome 314us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome
Accrued U.S. tax on unremitted earnings 107nov_DeferredTaxLiabilitiesTaxAccruedLiabilities 92nov_DeferredTaxLiabilitiesTaxAccruedLiabilities 92nov_DeferredTaxLiabilitiesTaxAccruedLiabilities
Other 377us-gaap_DeferredTaxLiabilitiesOther 164us-gaap_DeferredTaxLiabilitiesOther 208us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 2,281us-gaap_DeferredIncomeTaxLiabilities 2,604us-gaap_DeferredIncomeTaxLiabilities 2,330us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability $ 1,331us-gaap_DeferredTaxLiabilities $ 1,859us-gaap_DeferredTaxLiabilities $ 1,568us-gaap_DeferredTaxLiabilities