ACQUISITIONS AND DIVESTITURES - 2015 Activity (Detail) - USD ($) $ in Millions	1 Months Ended			3 Months Ended										9 Months Ended	12 Months Ended
	Oct. 31, 2015	Jun. 30, 2015	Apr. 30, 2015	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceed from sale of equity method investments															$ 0	$ 0	$ 391
Proceeds form sale of operations															0	0	854
Proceeds from sale of oil and gas properties															758	134	268
Asset impairments				$ 32	$ 160	$ 39	$ 23	$ 144	$ 951	$ 238	$ 42				8	1,103	9,472
Leasehold and property acquisitions amount															178	181	367
Gain (loss) on sale of oil and gas properties																21	135
Transaction, reorganization, and separation															16	39	132
Canada
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds form sale of operations			$ 854
Australia | Woodside Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and gas properties			$ 2,800
Australia | Consortium Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of upstream assets		$ (139)
Proceeds from sale of oil and gas properties		$ 1,900
North America Onshore Regions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Leasehold and property acquisitions amount															188	$ 181	367
Yara Pilbara Holdings Pty Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity ownership percentage	49.00%
Proceed from sale of equity method investments	$ 391
Impairment on equity method investment														$ 148
Kitimat LNG | Canada
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity ownership percentage			50.00%
Proceeds form sale of operations			$ 344
Upstream Assets | Canada
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds form sale of operations			510
Gain (loss) on sale of upstream assets																	$ 146
Upstream Assets | Australia | Woodside Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and gas properties			1,400
LNG Assets | Australia | Woodside Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of oil and gas properties			$ 1,400
Wheatstone LNG | Australia
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of upstream assets									$ (23)
Asset impairments												$ 49	$ 833
Consulting fees
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction, reorganization, and separation															11
Employee separation, consolidation of office space, and other reorganization efforts
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction, reorganization, and separation															$ 5