Acquisitions and Divestitures - Additional Information - 2015 Activity - Australia Divestiture (Detail) - USD ($) $ in Millions	1 Months Ended		3 Months Ended									12 Months Ended
	Jun. 30, 2015	Apr. 30, 2015	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of other oil and gas properties												$ 134	$ 268		$ 96
Asset impairments			$ 144	$ 951	$ 238	$ 42	$ 5,100	$ 4,100	$ 660	$ 2,100		$ 1,103	$ 9,472	[1],[2]	$ 7,102	[1],[2]
Loss on sale of upstream assets	$ 139
Wheatstone LNG [Member] | Australia [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairments											$ 833
Loss on sale of upstream assets				$ 23
Wheatstone LNG [Member] | Oil and Gas Properties [Member] | Australia [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of upstream assets										$ 49
Woodside Sale [Member] | Australia [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of other oil and gas properties		$ 2,800
Consortium Sale [Member] | Australia [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of other oil and gas properties	$ 1,900
LNG Assets [Member] | Woodside Sale [Member] | Australia [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of other oil and gas properties		1,400
Upstream Assets [Member] | Woodside Sale [Member] | Australia [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of other oil and gas properties		$ 1,400

[1] Financial information for 2015 and 2014 has been recast to reflect retrospective application of the successful efforts method of accounting. See Note 1.

[2] Financial information for 2015 and 2014 has been recast to reflect retrospective application of the successful efforts method of accounting. See Note 1.