Consolidated Statements Of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Cash flows from operating activities:
Net earnings (loss)		$ 1,078	$ (1,458)	[1]	$ (13,645)	[1]
Adjustments to reconcile net earnings (loss) to net cash from operating activities:
Depreciation, depletion and amortization		2,074	2,096	[1]	4,022	[1]
Exploratory dry hole expense and unproved leasehold impairments		219	113	[1]	248	[1]
Asset impairments		17	1,310	[1]	17,647	[1]
Gains and losses on asset sales		(217)	(1,483)	[1]	7	[1]
Deferred income tax expense (benefit)		(294)	41	[1]	(5,976)	[1]
Commodity derivatives		(157)	201	[1]	(503)	[1]
Cash settlements on commodity derivatives		53	1	[1]	2,416	[1]
Other derivatives and financial instruments		23	185	[1]	(235)	[1]
Cash settlements on other derivatives and financial instruments		(6)	(143)	[1]	272	[1]
Asset retirement obligation accretion		62	75	[1]	75	[1]
Share-based compensation		198	233	[1]	244	[1]
Other		(122)	270	[1]	312	[1]
Net change in working capital		21	24	[1]	(265)	[1]
Change in long-term other assets		(46)	36	[1]	285	[1]
Change in long-term other liabilities		6	(1)	[1]	(6)	[1]
Net cash from operating activities		2,909	1,500	[1]	4,898	[1]
Cash flows from investing activities:
Capital expenditures		(2,759)	(2,047)	[1]	(4,787)	[1]
Acquisitions of property, equipment and businesses		(46)	(1,641)	[1]	(1,107)	[1]
Divestitures of property and equipment		417	3,113	[1]	107	[1]
Proceeds from sale of investment		190
Other		(12)	(19)	[1]	(16)	[1]
Net cash from investing activities		(2,210)	(594)	[1]	(5,803)	[1]
Cash flows from financing activities:
Borrowings of long-term debt, net of issuance costs		2,376	2,145	[1]	4,772	[1]
Repayments of long-term debt		(2,118)	(4,409)	[1]	(2,634)	[1]
Payment of installment payable		(250)
Net short-term debt repayments	[1]		(626)		(307)
Early retirement of debt		(6)	(265)	[1]
Issuance of common stock	[1]		1,469
Sale of subsidiary units	[1]				654
Issuance of subsidiary units		501	892	[1]	25	[1]
Dividends paid on common stock		(127)	(221)	[1]	(396)	[1]
Contributions from noncontrolling interests		57	168	[1]	16	[1]
Distributions to noncontrolling interests		(354)	(304)	[1]	(254)	[1]
Shares exchanged for tax withholdings		(68)	(35)	[1]	(51)	[1]
Other		(2)	(10)	[1]	(13)	[1]
Net cash from financing activities		9	(1,196)	[1]	1,812	[1]
Effect of exchange rate changes on cash		6	(61)	[1]	(77)	[1]
Net change in cash and cash equivalents		714	(351)	[1]	830	[1]
Cash and cash equivalents at beginning of period	[1]	1,959	2,310		1,480
Cash and cash equivalents at end of period		$ 2,673	$ 1,959	[1]	$ 2,310	[1]

[1] Prior year amounts have been recast due to change in accounting principle. See Note 2 in “Item 8. Financial Statements and Supplementary Data” of this report.