Other Current Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accrued operating expenses	$ 76	$ 110
Accrued exploration and development	608	463
Accrued compensation and benefits	76	201
Accrued interest	146	145
Accrued income taxes	77	22
Current debt	150	0
Current asset retirement obligation	35	66
Refundable deposits	142	174
Other	91	77
Total other current liabilities	$ 1,401	$ 1,258