STATEMENT OF CONSOLIDATED CASH FLOWS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss) including noncontrolling interests	$ 459,000,000	$ (4,622,000,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Unrealized derivative instrument losses (gains), net	(10,000,000)	103,000,000
Gain on divestitures, net	(2,000,000)	(25,000,000)
Exploratory dry hole expense and unproved leasehold impairments	37,000,000	43,000,000
Depreciation, depletion, and amortization	342,000,000	566,000,000
Asset retirement obligation accretion	28,000,000	27,000,000
Impairments	0	4,472,000,000
Provision for (benefit from) deferred income taxes	18,000,000	(33,000,000)
Other	(25,000,000)	(8,000,000)
Changes in operating assets and liabilities:
Receivables	(166,000,000)	221,000,000
Inventories	(3,000,000)	30,000,000
Drilling advances and other current assets	12,000,000	(26,000,000)
Deferred charges and other long-term assets	(13,000,000)	(7,000,000)
Accounts payable	73,000,000	(80,000,000)
Accounts payable to APA Corporation	15,000,000	0
Accrued expenses	(64,000,000)	(173,000,000)
Deferred credits and noncurrent liabilities	(10,000,000)	14,000,000
NET CASH PROVIDED BY OPERATING ACTIVITIES	691,000,000	502,000,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to upstream oil and gas property	(237,000,000)	(511,000,000)
Additions to Altus gathering, processing, and transmission (GPT) facilities	(1,000,000)	(19,000,000)
Leasehold and property acquisitions	(2,000,000)	(1,000,000)
Contributions to Altus equity method interests	(21,000,000)	(83,000,000)
Proceeds from sale of oil and gas properties	3,000,000	126,000,000
Other, net	7,000,000	(21,000,000)
NET CASH USED IN INVESTING ACTIVITIES	(251,000,000)	(509,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from (payments on) Apache credit facility, net	(85,000,000)	250,000,000
Proceeds from Altus credit facility, net	33,000,000	72,000,000
Payments on fixed-rate debt	(6,000,000)	0
Distributions to noncontrolling interest - Egypt	(40,000,000)	(32,000,000)
Distributions to Altus Preferred Unit limited partners	(11,000,000)	0
Distributions to APA Corporation	(292,000,000)
Dividends paid	(9,000,000)	(94,000,000)
Other	(11,000,000)	(8,000,000)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(421,000,000)	188,000,000
NET INCREASE IN CASH AND CASH EQUIVALENTS	19,000,000	181,000,000
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	262,000,000	247,000,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	281,000,000	428,000,000
SUPPLEMENTARY CASH FLOW DATA:
Interest paid, net of capitalized interest	113,000,000	126,000,000
Income taxes paid, net of refunds	$ 124,000,000	$ 98,000,000