Statement of Consolidated Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities
Net income (loss)	$ (2,839)	$ (240)	$ (115)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
(Gains) on asset sales, net	(87)	(22)	(32)
Depreciation, depletion and amortization	2,074	2,122	1,883
Impairment	2,126	0	0
Exploratory dry hole costs	192	49	165
Exploration lease and other impairment	51	17	37
Pension settlement loss	0	93	4
Stock compensation expense	79	85	72
Noncash (gains) losses on commodity derivatives, net	260	116	182
Provision (benefit) for deferred income taxes and other tax accruals	(53)	17	(120)
Loss on debt extinguishment	0	0	53
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	267	(383)	(138)
(Increase) decrease in inventories	(117)	(16)	(12)
Increase (decrease) in accounts payable and accrued liabilities	(533)	4	88
Increase (decrease) in taxes payable	(16)	16	(2)
Changes in other operating assets and liabilities	(71)	(216)	(126)
Net cash provided by (used in) operating activities	1,333	1,642	1,939
Cash Flows From Investing Activities
Additions to property, plant and equipment - E&P	(1,896)	(2,433)	(1,854)
Additions to property, plant and equipment - Midstream	(301)	(396)	(243)
Payments for Midstream equity investments	0	(33)	(67)
Proceeds from asset sales, net of cash sold	493	22	607
Other, net	(3)	(3)	(9)
Net cash provided by (used in) investing activities	(1,707)	(2,843)	(1,566)
Cash Flows From Financing Activities
Net borrowings (repayments) of debt with maturities of 90 days or less	152	32	0
Debt with maturities of greater than 90 days – Borrowings	1,000	760	0
Debt with maturities of greater than 90 days – Repayments	0	(8)	(633)
Payments on finance lease obligations	(7)	(49)	0
Common stock acquired and retired	0	(25)	(1,365)
Cash dividends paid	(309)	(316)	(345)
Noncontrolling interests, net	(261)	(353)	(211)
Other, net	(7)	11	28
Net cash provided by (used in) financing activities	568	52	(2,526)
Net Increase (Decrease) in Cash and Cash Equivalents	194	(1,149)	(2,153)
Cash and Cash Equivalents at Beginning of Year	1,545	2,694	4,847
Cash and Cash Equivalents at End of Year	$ 1,739	$ 1,545	$ 2,694