Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Income from continuing operations	$ 313	$ 548
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	190us-gaap_DepreciationAndAmortization	191us-gaap_DepreciationAndAmortization
Deferred income taxes	(7)	45
Equity income in unconsolidated affiliates	(9)	(10)
Other, net	91us-gaap_OtherNoncashIncomeExpense	64us-gaap_OtherNoncashIncomeExpense
Change in operating assets and liabilities, net of acquisitions:
Receivables	369	(325)
Inventories	(126)us-gaap_IncreaseDecreaseInInventories	(101)us-gaap_IncreaseDecreaseInInventories
Costs in excess of billings	(47)nov_CostsInExcessOfBillings	20nov_CostsInExcessOfBillings
Prepaid and other current assets	34	(133)
Accounts payable	(201)	67
Billings in excess of costs	(278)nov_BillingsInExcessOfCosts	307nov_BillingsInExcessOfCosts
Income taxes payable	1	(79)
Other assets/liabilities, net	(216)	(109)
Net cash provided by continuing operating activities	114	485
Discontinued operations		3
Net cash provided by operating activities	114	488
Cash flows from investing activities:
Purchases of property, plant and equipment	(130)	(125)
Business acquisitions, net of cash acquired	(23)	(2)
Other	4	7
Net cash used in continuing investing activities	(149)	(120)
Discontinued operations		(6)
Net cash used in investing activities	(149)	(126)
Cash flows from financing activities:
Borrowings against lines of credit and other debt	1,871
Repayments on debt	(792)us-gaap_RepaymentsOfLongTermDebt	(1)us-gaap_RepaymentsOfLongTermDebt
Cash dividends paid	(185)us-gaap_PaymentsOfDividendsCommonStock	(111)us-gaap_PaymentsOfDividendsCommonStock
Share repurchases	(1,330)
Proceeds from stock options exercised	3	5
Other	(3)	2
Net cash used in continuing financing activities	(436)	(105)
Discontinued operations	0	0
Net cash used in financing activities	(436)	(105)
Effect of exchange rates on cash	(41)	(5)
Increase (decrease) in cash and cash equivalents	(512)	252
Cash and cash equivalents, beginning of period	3,536	3,436
Cash and cash equivalents, end of period	3,024	3,688
Cash payments during the period for:
Interest	6us-gaap_InterestPaidNet	7us-gaap_InterestPaidNet
Income taxes	$ 96us-gaap_IncomeTaxesPaidNet	$ 296us-gaap_IncomeTaxesPaidNet

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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