Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net income	$ 174	$ 356
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	554	590
Impairments	6	8
Exploratory dry well costs and unproved property impairments	49	42
Net gain on disposal of assets	(42)	(257)
Deferred income taxes	(31)	(31)
Net loss on derivative instruments	91	102
Net settlements of derivative instruments	22	(59)
Pension and other post retirement benefits, net	(25)	(34)
Stock-based compensation	14	14
Equity method investments, net	14	32
Changes in:
Current receivables	(73)	(130)
Inventories	4	(9)
Current accounts payable and accrued liabilities	(102)	81
Other current assets and liabilities	(14)	25
All other operating, net	(154)	(31)
Net cash provided by operating activities	515	649
Investing activities:
Additions to property, plant and equipment	(615)	(662)
Additions to other assets	14	(72)
Acquisitions, net of cash acquired	0	(4)
Disposal of assets, net of cash transferred to the buyer	13	1,180
Equity method investments - return of capital	12	9
All other investing, net	12	(2)
Net cash provided by (used in) investing activities	(564)	449
Financing activities:
Purchases of common stock	(30)	(9)
Dividends paid	(41)	(42)
All other financing, net	(1)	2
Net cash used in financing activities	(72)	(49)
Effect of exchange rate on cash and cash equivalents	1	1
Net increase (decrease) in cash and cash equivalents	(120)	1,050
Cash and cash equivalents at beginning of period	1,462	563
Cash and cash equivalents at end of period	1,019	1,613
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents	323
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	$ 1,342	$ 1,613