Leases - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Leases [Line Items]
Lease obligations as percentage of present value of future minimum lease payments in lease arrangement	100.00%
Carrying value of finance lease asset	$ 332,000,000	$ 0
Carrying value of finance lease obligation	$ 286,000,000
Lease payments as percentage of lease costs	100.00%
Floating, Storage and Offloading Vessel
Leases [Line Items]
North Malay Basin, offshore Peninsular Malaysia - Hess operated interest		50.00%
Gain or loss on sale of transaction		$ 0
Finance lease term	14 years 6 months
Carrying value of finance lease asset	$ 256,000,000
Carrying value of finance lease obligation	266,000,000
Floating, Storage and Offloading Vessel | Additional Finance Lease Obligation
Leases [Line Items]
Finance lease obligation to be settlement in future	$ 20,000,000