Segment Reporting - Operating Information by Segment (Detail) - USD ($) $ in Millions		3 Months Ended						12 Months Ended
		Dec. 31, 2019		Sep. 30, 2019	[2]	Dec. 31, 2018		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	[1]							$ 8,431		$ 6,705		$ 2,985
Operating (loss) income								(2,082)		(2,256)		307
Goodwill impairment		$ 60	[2]	$ 1,370		$ 2,168	[3],[4]	1,430	[5]	2,168	[5]
Depreciation and amortization								267		279		101
Capital expenditures	[6]							92		86		119
Income (loss) from investments in unconsolidated affiliates								34		13		(12)
Total assets		8,737				9,440		8,737		9,440
Investments in unconsolidated affiliates	[7]	455				452		455		452
NCSA [Member]
Segment Reporting Information [Line Items]
Revenues								144
Goodwill impairment								1,111
EARC [Member]
Segment Reporting Information [Line Items]
Goodwill impairment		59						319
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating (loss) income								(1,527)		(1,746)		527
Operating Segments [Member] | NCSA [Member]
Segment Reporting Information [Line Items]
Revenues								4,627		3,928		246
Operating (loss) income								(1,546)		(1,537)		(4)
Goodwill impairment	[5]							1,111		1,484
Depreciation and amortization								65		59		26
Capital expenditures	[6]							7		5		23
Income (loss) from investments in unconsolidated affiliates								1				(1)
Total assets		1,826				3,257		1,826		3,257
Operating Segments [Member] | EARC [Member]
Segment Reporting Information [Line Items]
Revenues								761		271		19
Operating (loss) income								(319)		(74)		(13)
Goodwill impairment	[5]							319		40
Depreciation and amortization								14		13
Capital expenditures	[6]							2
Income (loss) from investments in unconsolidated affiliates								(5)		(5)		(4)
Total assets		554				1,169		554		1,169
Investments in unconsolidated affiliates	[7]	1				2		1		2
Operating Segments [Member] | MENA [Member]
Segment Reporting Information [Line Items]
Revenues								1,790		1,704		2,120
Operating (loss) income								181		328		451
Depreciation and amortization								50		51		31
Capital expenditures	[6]							18		19		31
Income (loss) from investments in unconsolidated affiliates								12		5
Total assets		1,317				1,472		1,317		1,472
Investments in unconsolidated affiliates	[7]	70				60		70		60
Operating Segments [Member] | APAC [Member]
Segment Reporting Information [Line Items]
Revenues								666		411		600
Operating (loss) income								1		56		93
Goodwill impairment	[5]									52
Depreciation and amortization								15		19		36
Capital expenditures	[6]							8		12		9
Income (loss) from investments in unconsolidated affiliates								4		(8)		(7)
Total assets		1,518				1,147		1,518		1,147
Investments in unconsolidated affiliates	[7]	3						3
Operating Segments [Member] | Technology [Member]
Segment Reporting Information [Line Items]
Revenues								587		391
Operating (loss) income								156		(519)
Goodwill impairment	[5]									592
Depreciation and amortization								74		92
Capital expenditures	[6]							2
Income (loss) from investments in unconsolidated affiliates								27		27
Total assets		2,590				2,752		2,590		2,752
Investments in unconsolidated affiliates	[7]	381				385		381		385
Corporate [Member]
Segment Reporting Information [Line Items]
Operating (loss) income	[8]							(555)		(510)		(220)
Depreciation and amortization								49		45		8
Capital expenditures	[6],[9]							55		50		$ 56
Income (loss) from investments in unconsolidated affiliates								(5)		(6)
Total assets	[10]	$ 932				(357)		$ 932		(357)
Investments in unconsolidated affiliates	[7]					$ 5				$ 5

[1] Intercompany amounts have been eliminated in consolidation.

[2] 2019—represents impairment of goodwill associated with our NCSA and EARC reporting units, resulting from our interim and annual impairment assessment. See Note 9, Goodwill and Other Intangible Assets, for further discussion.

[3] 2018—represents impairment of goodwill associated with our NCSA, EARC, APAC and Technology reporting units, resulting from our annual impairment assessment.

[4] Results in the second, third and fourth quarters of 2018 reflect impacts of the Combination from the Combination Date.

[5] Represents impairment of goodwill associated with our NCSA and EARC reporting units in 2019 and our NCSA, EARC, APAC and Technology reporting units in 2018. See Note 9, Goodwill and Other Intangible Assets, for further discussion. The goodwill impairment values are included within the applicable operating group’s Operating loss.

[6] Capital expenditures reported represent cash purchases. At December 31, 2019, 2018 and 2017, we had approximately $160 million, $26 million and $8 million, respectively, of accrued and unpaid capital expenditures reported in PP&E and accrued liabilities.

[7] The Consolidated Balance Sheets as of December 31, 2019 and 2018 include approximately $48 million and $15 million of accounts receivable, respectively, from our unconsolidated affiliates.

[8]   ⁽¹⁾ Corporate operating results include: 2019   • $57 million in transaction costs (see Note 12, Restructuring and Integrations Costs and Transaction Costs);   • $114 million in restructuring and integration costs (see Note 12, Restructuring and Integrations Costs and Transaction Costs); and   • $18 million of impairment charges associated with our marine vessels (see Note 16, Fair Value Measurements). 2018   • $48 million in transaction costs associated with the Combination;   • $134 million in restructuring and integration costs;   • $58 million of vessel related impairment charges; and   • $25 million of expense associated with the need to make alternate arrangements for a third-party vessel charter, because the previously designated vessel was withdrawn from the market.   2017   • $4 million gain on sale of assets; and   • $9 million in transaction costs associated with the Combination (see Note 3, Business Combination).

[9] Corporate capital expenditures in 2019 and 2018 include upgrades to the Amazon. Corporate capital expenditures in 2017 include the purchase of the Amazon, a pipelay and construction vessel described in Note 14, Lease Obligations. Following the purchase, we sold this vessel to an unrelated third party and simultaneously entered into an 11-year bareboat charter agreement.

[10] Corporate assets at December 31, 2018 include negative cash balances associated with our international cash pooling program, which ceased in the fourth quarter of 2019.