Annual report pursuant to Section 13 and 15(d)

Reportable Segments - Non-printing section (Detail)

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Reportable Segments - Non-printing section (Detail) - Exxon Neftegas Limited (ENL) [Member]
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Percent of total revenues   18.70% 15.60%
International Drilling [Member]      
Segment Reporting Information [Line Items]      
Percent of segment revenues 45.60% 39.20% 33.30%