Commitments and Contingencies - Additional Information (Detail) - USD ($)			12 Months Ended
	Mar. 21, 2016	Mar. 20, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jun. 06, 2016	Mar. 12, 2014
Commitment And Contingencies [Line Items]
Accrued liability for legal contingencies			$ 15,000,000
Environmental tax and royalty obligations							$ 100,000,000
Retain right of obligations			67,500,000
Maximum cost considered to be recognized for additional reserve			300,000
Undiscounted reserve for environmental remediation			51,000,000
Net rental expenses			59,000,000	$ 57,000,000	$ 45,000,000
Contractual obligation cost incurred			86,000,000	$ 92,000,000	$ 89,000,000
Apollo Exploration Lawsuit [Member]
Commitment And Contingencies [Line Items]
Loss contingency damages sought value	$ 500,000,000
Minimum [Member] | Apollo Exploration Lawsuit [Member]
Commitment And Contingencies [Line Items]
Loss contingency damages sought value		$ 1,100,000,000
Maximum [Member] | Escheat Audits [Member]
Commitment And Contingencies [Line Items]
Loss contingency estimate of possible loss			$ 200,000
Australian Operations [Member] | Australian Operations Divestiture Dispute [Member]
Commitment And Contingencies [Line Items]
Loss contingency estimate of possible loss						$ 200,000,000