Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities:
Net income (loss)	$ 946	$ (1,451)	$ 480
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	2,066	2,316	2,397
Impairments	60	144	24
Exploratory dry well costs and unproved property impairments	125	159	114
Net (gain) loss on disposal of assets	19	(9)	(50)
Loss on early extinguishment of debt	121	28	3
Deferred income taxes	(27)	(22)	(34)
Unrealized (gain) loss on derivative instruments, net	(16)	27	124
Pension and other post retirement benefits, net	(31)	(43)	(52)
Stock-based compensation	40	57	60
Equity method investments, net	(76)	210	18
Changes in:
Current receivables	(389)	367	52
Inventories	(1)	(4)	3
Current accounts payable and accrued liabilities	369	(381)	(187)
Other current assets and liabilities	46	75	(4)
All other operating, net	(13)	0	(199)
Net cash provided by operating activities	3,239	1,473	2,749
Investing activities:
Additions to property, plant and equipment	(1,046)	(1,343)	(2,550)
Additions to other assets	0	15	36
Acquisitions, net of cash acquired	(47)	(1)	(293)
Disposal of assets, net of cash transferred to the buyer	22	18	(76)
Equity method investments - return of capital	61	7	64
All other investing, net	0	1	1
Net cash used in investing activities	(1,010)	(1,303)	(2,818)
Financing activities:
Borrowings	0	400	600
Debt repayments	(1,400)	(500)	(600)
Debt extinguishment costs	(117)	(27)	(2)
Purchases of common stock	(734)	(92)	(362)
Dividends paid	(141)	(64)	(162)
All other financing, net	1	(3)	(9)
Net cash used in financing activities	(2,391)	(286)	(535)
Net increase (decrease) in cash and cash equivalents	(162)	(116)	(604)
Cash and cash equivalents at beginning of period	742	858	1,462
Cash and cash equivalents at end of period	$ 580	$ 742	$ 858