Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended										12 Months Ended
	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	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss Contingency, Damages Paid, Value		$ 18									$ 18
Unamortized Costs Capitalized Less Related Deferred Income Taxes Exceed Ceiling Limitation Expense Gross	$ 0	0	$ 522	$ 506	$ 702	$ 1,889	$ 1,521	$ 788			1,028	$ 4,900
Ceiling test and other impairments	0	0	522	506	702	1,889	1,521	792			1,028	4,904	$ 0
Income (Loss) from Continuing Operations Attributable to Parent											(1,230)	(3,362)	650
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent											0	0	250
Net Income (Loss) Attributable to Parent	$ 13	$ 48	$ (667)	$ (624)	$ (663)	$ (1,227)	$ (992)	$ (480)			$ (1,230)	$ (3,362)	$ 900
Income (loss) from continuing operations											$ (6.36)	$ (21.18)	$ 4.76
Income (loss) from discontinued operations											0.00	0.00	1.83
Earnings (Loss) Per Share, Basic	$ 0.07	$ 0.24	$ (3.36)	$ (3.52)	$ (4.06)	$ (7.52)	$ (6.09)	$ (3.30)			(6.36)	(21.18)	6.59
Income (loss) from continuing operations											(6.36)	(21.18)	4.71
Income (loss) from discontinued operations											0.00	0.00	1.81
Earnings (Loss) Per Share, Diluted	$ 0.07	$ 0.24	$ (3.36)	$ (3.52)	$ (4.06)	$ (7.52)	$ (6.09)	$ (3.30)			$ (6.36)	$ (21.18)	$ 6.52
Gain on Sale of Malaysia, Before Income Tax									$ (15)	$ 388	$ 0	$ 0	$ 373
Gain on Sale of Malaysia, Net of Tax									$ (10)	$ 252
Continuing Operations [Member]
Oil and Gas Revenue	$ 415	$ 392	$ 381	$ 284	$ 362	$ 377	$ 469	$ 349			1,472	1,557	2,288
Ceiling test and other impairments											1,028	4,904	0
Income (loss) from operations	112	45	(498)	(578)	(730)	(1,951)	(1,496)	(884)			(919)	(5,061)	575
UNITED STATES
Unamortized Costs Capitalized Less Related Deferred Income Taxes Exceed Ceiling Limitation Expense Gross	$ 0	$ 0	$ 501	$ 461	$ 656	$ 1,817	$ 1,521	$ 788			962	4,782
Oil and Gas Revenue											1,255	1,295	$ 2,249
Ceiling test and other impairments											$ 962	$ 4,786