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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) Rigs | Dec. 31, 2014 USD ($) Rigs | Dec. 31, 2013 USD ($) | Sep. 30, 2015 Rigs
Commitment And Contingencies [Line Items] |  |  |  |
Remaining number of wells | Rigs | 2,034 | 3,632 |  | 2,188
Rental expense related to operating leases | $ 327 | $ 390 | $ 336 |
Brazil [Member] |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |
Reduction in Rig Systems segment backlog, due to contract termination | (1,200) |  |  |
Remaining revenue backlog | $ 1,800 |  |  |
Remaining number of wells | Rigs | 15 |  |  |

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- Definition The total number of producing oil wells and oil wells capable of production, in which the entity owns an undivided working interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (a) + Details
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