Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOW FROM OPERATING ACTIVITIES
Net income (loss)	$ 4,131	$ 1,311	$ (574)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Income from discontinued operations	0	0	(428)
Depreciation, depletion and amortization of assets	3,977	4,002	4,268
Deferred income tax (benefit) provision	371	(719)	(517)
Other noncash charges to income	34	219	116
Asset impairments and related items	561	545	665
Gain on sales of equity investments and other assets, net	(974)	(667)	(202)
Undistributed earnings from equity investments	(43)	(68)	3
Dry hole expenses	56	51	33
Changes in operating assets and liabilities:
Increase in receivables	(740)	(158)	(1,091)
Decrease (increase) in inventories	(108)	(349)	17
Decrease in other current assets	94	39	65
(Decrease) increase in accounts payable and accrued liabilities	195	(89)	609
Increase in current domestic and foreign income taxes	38	64	17
Other operating, net	77	680	(461)
Operating cash flow from continuing operations	7,669	4,861	2,520
Operating cash flow from discontinued operations, net of taxes	0	0	864
Net cash provided by operating activities	7,669	4,861	3,384
CASH FLOW FROM INVESTING ACTIVITIES
Capital expenditures	(4,975)	(3,599)	(2,717)
Change in capital accrual	55	122	(114)
Payments for purchases of assets and businesses	(928)	(1,064)	(2,044)
Sales of equity investments and assets, net	2,824	1,403	302
Other, net	(182)	59	(170)
Net cash used by investing activities	(3,206)	(3,079)	(4,743)
CASH FLOW FROM FINANCING ACTIVITIES
Proceeds from long-term debt, net	978	0	4,203
Payments of long-term debt	(500)	0	(2,710)
Proceeds from issuance of common stock	33	28	36
Purchases of treasury stock	(1,248)	(25)	(22)
Cash dividends paid	(2,374)	(2,346)	(2,309)
Other, net	9	0	0
Net cash used by financing activities	(3,102)	(2,343)	(802)
Increase (decrease) in cash, cash equivalents, and restricted cash	1,361	(561)	(2,161)
Cash, cash equivalents, and restricted cash — beginning of year	1,672	2,233	4,394
Cash and cash equivalents — end of year	$ 3,033	$ 1,672	$ 2,233