Other Current Liabilities - Details of Other Current Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accrued operating expenses	$ 106	$ 110
Accrued exploration and development	590	463
Accrued compensation and benefits	56	201
Accrued interest	107	145
Accrued income taxes	50	22
Current debt	150	0
Current asset retirement obligation	56	66
Refundable deposits	134	174
Other	85	77
Total other current liabilities	$ 1,334	$ 1,258