Segment Reporting - Operating Information about Revenues by Geography (Detail) - USD ($) $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	[1]	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	$ 1,962	$ 2,121	$ 2,137	$ 2,211	$ 2,073		$ 2,289		$ 1,735		$ 608		$ 8,431	$ 6,705	$ 2,985
Russia [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues													303	96
United States [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues													4,431	3,695	102
Saudi Arabia [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues													999	1,304	1,965
Australia [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues													168	253	344
Qatar [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues													467	173	149
Mexico [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues													216	191	143
India [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues													373	144	201
United Arab Emirates [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues													271	130	5
Denmark [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues													332	118
Other countries [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues													$ 871	$ 601	$ 76

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