OTHER INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Interest paid	$ 44	$ 48
Other current assets
Amount due from joint interest partners	42		$ 51
Derivative assets from commodities contracts	34		39
Accrued liabilities
Greenhouse gas obligations	94		89
Accrued interest	77		25
Accrued employee-related costs	44		91
Derivative liabilities from commodities contracts	39		103
Other long-term liabilities
Non-current asset retirement obligation	$ 402		$ 397