XML 71 R10.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Costs and Estimated Earnings on Uncompleted Contracts | 3 Months Ended
--- | ---
Mar. 31, 2013
Text Block [Abstract] |
Costs and Estimated Earnings on Uncompleted Contracts |
4. | Costs and Estimated Earnings on Uncompleted Contracts
Costs and estimated earnings on uncompleted contracts consist of (in millions):
|  | March 31, |  |  | December 31, |
|  | 2013 |  |  | 2012 |
Costs incurred on uncompleted contracts |  | $ | 6,168 |  |  | $ | 5,731 |
Estimated earnings |  |  | 3,208 |  |  |  | 3,160 |
|  |  | 9,376 |  |  |  | 8,891 |
Less: Billings to date |  |  | 9,136 |  |  |  | 8,855 |
|  | $ | 240 |  |  | $ | 36 |
Costs and estimated earnings in excess of billings on uncompleted contracts |  | $ | 1,333 |  |  | $ | 1,225 |
Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (1,093 | ) |  |  | (1,189 | )
|  | $ | 240 |  |  | $ | 36 |

X
- Definition Costs and estimated earnings on uncompleted contracts. + References No definition available. + Details
Name: | nov_CostsAndEstimatedEarningsOnUncompletedContractsDisclosureTextBlock
Namespace Prefix: | nov_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration