Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Income from continuing operations	$ 2,455	$ 2,181	$ 2,375
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	778us-gaap_DepreciationAndAmortization	738us-gaap_DepreciationAndAmortization	616us-gaap_DepreciationAndAmortization
Deferred income taxes	(300)	(336)	(90)
Stock-based compensation	101us-gaap_ShareBasedCompensation	92us-gaap_ShareBasedCompensation	80us-gaap_ShareBasedCompensation
Excess tax benefit from stock-based compensation	(15)	(20)	(25)
Equity income in unconsolidated affiliates	(58)	(63)	(58)
Dividend from unconsolidated affiliate	73	66	61
Intangible asset impairment	104
Other	181us-gaap_OtherNoncashIncomeExpense	72us-gaap_OtherNoncashIncomeExpense	77us-gaap_OtherNoncashIncomeExpense
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Inventories	(710)us-gaap_IncreaseDecreaseInInventories	238us-gaap_IncreaseDecreaseInInventories	(974)us-gaap_IncreaseDecreaseInInventories
Costs in excess of billings	(262)nov_CostsInExcessOfBillings	(314)nov_CostsInExcessOfBillings	(632)nov_CostsInExcessOfBillings
Prepaid and other current assets	(60)	41	(221)
Accounts payable	95	18	40
Billings in excess of costs	(59)nov_BillingsInExcessOfCosts	582nov_BillingsInExcessOfCosts	324nov_BillingsInExcessOfCosts
Income taxes payable	(124)	217	(408)
Other assets/liabilities, net	479	84	(41)
Net cash provided by continuing operating activities	2,525	3,080	632
Discontinued operations	89	317	(12)
Net cash provided by operating activities	2,614	3,397	620
Cash flows from investing activities:
Purchases of property, plant and equipment	(699)	(614)	(569)
Business acquisitions, net of cash acquired	(291)	(2,397)	(1,767)
Cash distributed in spin-off	(253)nov_CashDistributionFromSpinOff
Other, net	151	101	35
Net cash used in continuing investing activities	(1,092)	(2,910)	(2,301)
Discontinued operations	(12)	(54)	(1,127)
Net cash used in investing activities	(1,104)	(2,964)	(3,428)
Cash flows from financing activities:
Borrowings against lines of credit and other debt	173	2,609	5,575
Payments against lines of credit and other debt	(155)us-gaap_RepaymentsOfLongTermDebt	(2,609)us-gaap_RepaymentsOfLongTermDebt	(2,937)us-gaap_RepaymentsOfLongTermDebt
Cash dividends paid	(703)us-gaap_PaymentsOfDividendsCommonStock	(389)us-gaap_PaymentsOfDividendsCommonStock	(209)us-gaap_PaymentsOfDividendsCommonStock
Share repurchases	(779)us-gaap_PaymentsForRepurchaseOfEquity
Proceeds from stock options exercised	108	58	113
Excess tax benefit from stock-based compensation	15	20	25
Other	(2)	7	17
Net cash provided by (used in) continuing financing activities	(1,343)	(304)	2,584
Discontinued operations		(1)	(1)
Net cash provided by (used in) financing activities	(1,343)	(305)	2,583
Effect of exchange rates on cash	(67)	(11)	9
Increase (decrease) in cash and cash equivalents	100	117	(216)
Cash and cash equivalents, beginning of period	3,436	3,319	3,535
Cash and cash equivalents, end of period	3,536	3,436	3,319
Cash payments during the period for:
Interest	102us-gaap_InterestPaidNet	111us-gaap_InterestPaidNet	40us-gaap_InterestPaidNet
Income taxes	$ 1,380us-gaap_IncomeTaxesPaidNet	$ 1,099us-gaap_IncomeTaxesPaidNet	$ 1,572us-gaap_IncomeTaxesPaidNet

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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