Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net income (loss)	$ 452	$ (5,096)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Discontinued operations	0	4,893
Depreciation, depletion and amortization	1,202	1,148
Impairments	42	4
Exploratory dry well costs and unproved property impairments	93	45
Net (gain) loss on disposal of assets	(307)	(7)
Deferred income taxes	(6)	38
Net (gain) loss on derivative instruments	254	(140)
Net Settlement Of Derivative Instruments	(166)	3
Pension and other postretirement benefits, net	(51)	(25)
Share-based Compensation	28	26
Equity method investments, net	27	61
Changes in:
Current receivables, changes in	(256)	(15)
Inventories, changes in	(17)	(5)
Current accounts payable and accrued liabilities, changes in	133	(41)
All other operating, net	(12)	34
Net cash provided by operating activities from continuing operations	1,416	923
Investing activities:
Additions to property, plant and equipment	(1,300)	(775)
Additions to other assets	(129)	0
Acquisitions, net of cash acquired	(25)	(1,828)
Disposal of assets, net of cash transferred to buyer	1,183	1,726
Equity method investments - return of capital	32	49
All other investing, net	7	(5)
Net cash provided by (used in) investing activities from continuing operations	(232)	(833)
Financing activities:
Debt repayments	0	(1)
Purchases of common stock	(11)	(10)
Dividends paid	(85)	(85)
All other financing, net	18	0
Net cash provided by (used in) financing activities	(78)	(96)
Cash flow from discontinued operations:
Net cash provided by discontinued operations	0	130
Effect of exchange rate on cash and cash equivalents	(2)	2
Net increase (decrease) in cash and cash equivalents	1,104	126
Cash and cash equivalents at beginning of period	563	2,488
Cash and cash equivalents at end of period	$ 1,667	$ 2,614