Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net earnings (loss)	$ (2,671)	$ (353)	$ 3,224
Adjustments to reconcile net earnings (loss) to net cash from operating activities:
Net (earnings) loss from discontinued operations, net of income taxes	128	274	(2,510)
Depreciation, depletion and amortization	1,300	1,497	1,228
Asset impairments	2,693		156
Leasehold impairments	152	18	94
Accretion on discounted liabilities	32	33	27
Total (gains) losses on commodity derivatives	(155)	454	(457)
Cash settlements on commodity derivatives	316	166	(420)
Gains on asset dispositions	(1)	(48)	(278)
Deferred income tax expense (benefit)	(328)	(25)	247
Share-based compensation	88	115	137
Early retirement of debt			312
Other	5	(6)	(19)
Changes in assets and liabilities, net	(95)	(82)	(158)
Net cash from operating activities - continuing operations	1,464	2,043	1,583
Cash flows from investing activities:
Capital expenditures	(1,153)	(1,910)	(2,116)
Acquisitions of property and equipment	(8)	(31)	(55)
Divestitures of property and equipment	34	390	500
Net cash from investing activities - continuing operations	(1,127)	(1,551)	(1,671)
Cash flows from financing activities:
Repayments of long-term debt		(162)	(922)
Early retirement of debt			(304)
Repurchases of common stock	(38)	(1,849)	(2,956)
Dividends paid on common stock	(257)	(140)	(149)
Contributions from noncontrolling interests	21	116
Distributions to noncontrolling interests	(14)
Shares exchanged for tax withholdings	(18)	(25)	(39)
Other		(1)	(7)
Net cash from financing activities - continuing operations	(306)	(2,061)	(4,377)
Net change in cash, cash equivalents and restricted cash of continuing operations	31	(1,569)	(4,465)
Cash flows from discontinued operations:
Operating activities	(110)	28	1,121
Investing activities	481	2,472	2,726
Financing activities	0	(1,578)	174
Effect of exchange rate changes on cash	(9)	45	206
Net change in cash, cash equivalents and restricted cash of discontinued operations	362	967	4,227
Net change in cash, cash equivalents and restricted cash	393	(602)	(238)
Cash, cash equivalents and restricted cash at beginning of period	1,844	2,446	2,684
Cash, cash equivalents and restricted cash at end of period	2,237	1,844	2,446
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	2,047	1,464	2,414
Restricted cash	190	380	32
Cash, cash equivalents and restricted cash at end of period	$ 2,237	$ 1,844	$ 2,446