Segment Reporting - Information about Operations in Different Segments (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues	[1]	$ 2,289	$ 959	$ 4,632	$ 2,267
Operating income		129	125	242	262
Depreciation and amortization		107	28	187	78
Capital expenditures		19	16	62	97
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income		202	177	550	404
Operating Segments [Member] | NCSA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	1,516	61	2,609	131
Operating income		97	(3)	148	(8)
Depreciation and amortization		21	5	37	16
Capital expenditures		2	6	4	21
Operating Segments [Member] | EARC [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	77		151	18
Operating income		(13)	(5)	(24)	(8)
Depreciation and amortization		5		8
Operating Segments [Member] | MENA [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	473	736	1,287	1,603
Operating income		89	164	256	346
Depreciation and amortization		19	13	35	35
Capital expenditures		2	7	9	18
Operating Segments [Member] | APAC [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	75	162	332	515
Operating income		9	21	125	74
Depreciation and amortization		3	8	12	21
Capital expenditures		4	2	9	8
Operating Segments [Member] | Technology [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	148		253
Operating income		20		45
Depreciation and amortization		45		59
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income	[2]	(73)	(52)	(308)	(142)
Depreciation and amortization		14	2	36	6
Capital expenditures	[3]	$ 11	$ 1	$ 40	$ 50

[1] Intercompany transactions were not significant for the three and nine months ended September 30, 2018 and 2017, respectively.

[2] Corporate operating results for the three and nine months ended September 30, 2018 include $31 million and $106 million of restructuring and integration costs, respectively. See Note 11, Restructuring and Integration Costs, for further discussion. Corporate operating results for the three and nine months ended September 30, 2018 also include $5 million and $45 million of transaction costs, respectively. See Note 3, Business Combination, for further discussion. Corporate operating results for the three and nine months ended September 30, 2017 includes approximately $3 million of gain on sale of assets.

[3] Corporate and other capital expenditures in the first nine months of 2017 include the purchase of the Amazon, a pipelay and construction vessel described further in Note 13, Lease Obligations.