Leased Facilities (Tables)

12 Months Ended

Dec. 31, 2015

Leased Facilities [Abstract]

Leased Facilities

	Lease Payments Under Minimum Commitments						Related
	Drilling Rigs						Sublease
	and Related						Rental
	Equipment		Other		Total		Income
	(millions of dollars)

2016	827		826		1,653		7
2017	408		595		1,003		6
2018	134		421		555		2
2019	89		255		344		2
2020	77		188		265		2
2021 and beyond	86		971		1,057		13
Total	1,621		3,256		4,877		32

Net Rental Cost

				2015		2014		2013
				(millions of dollars)

Rental cost
	Drilling rigs and related equipment			1,853		1,763		1,424
	Other			2,120		2,314		2,417
		Total		3,973		4,077		3,841
	Less sublease rental income			44		52		44
Net rental cost				3,929		4,025		3,797