OTHER INFORMATION (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Cash restricted for capital investment	$ 17
Interest paid	251	$ 244
Other current assets
Amount due from joint interest partners	71		$ 51
Derivative assets from commodities contracts	46		39
Assets held for sale	12		19
Accrued liabilities
Net greenhouse gas obligations	104		89
Accrued interest	66		25
Accrued employee-related costs	63		91
Derivative liabilities from commodities contracts	60		103
Liabilities held for sale	0		7
Other long-term liabilities
Non-current asset retirement obligation	$ 410		$ 397