CONSOLIDATED BALANCE SHEET (Unaudited) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents ($51 and $24 related to Altus VIE)	$ 538	$ 262
Receivables, net of allowance of $98 and $95	1,071	908
Other current assets (Note 5) ($12 and $5 related to Altus VIE)	736	676
Total current assets	2,345	1,846
Oil and Gas Property, Full Cost Method, Net [Abstract]
Oil and gas properties	42,054	41,819
Gathering, processing, and transmission facilities ($206 and $206 related to Altus VIE)	671	670
Other ($3 and $3 related to Altus VIE)	1,139	1,140
Less: Accumulated depreciation, depletion, and amortization ($16 and $13 related to Altus VIE)	(35,146)	(34,810)
Property and equipment, net	8,718	8,819
OTHER ASSETS:
Equity method interests (Note 6) ($1,567 and $1,555 related to Altus VIE)	1,567	1,555
Deferred charges and other ($6 and $5 related to Altus VIE)	497	526
Total assets	13,127	12,746
CURRENT LIABILITIES:
Accounts payable	524	444
Current debt	2	2
Other current liabilities (Note 7) ($8 and $4 related to Altus VIE)	812	862
Total current liabilities	1,338	1,308
LONG-TERM DEBT (Note 9) ($657 and $624 related to Altus VIE)	8,713	8,770
DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES:
Income taxes	237	215
Asset retirement obligation (Note 8) ($65 and $64 related to Altus VIE)	1,914	1,888
Other ($161 and $144 related to Altus VIE)	581	602
Total deferred credits and other noncurrent liabilities	2,732	2,705
REDEEMABLE NONCONTROLLING INTEREST - ALTUS PREFERRED UNIT LIMITED PARTNERS (Note 12)	605	608
EQUITY (DEFICIT):
Common stock, $0.625 par, 860,000,000 shares authorized, 418,917,594 and 418,429,375 shares issued, respectively	262	262
Paid-in capital	11,727	11,735
Accumulated deficit	(10,073)	(10,461)
Treasury stock, at cost, 40,944,759 and 40,946,745 shares, respectively	(3,189)	(3,189)
Accumulated other comprehensive income	15	14
APA SHAREHOLDERS’ DEFICIT	(1,258)	(1,639)
TOTAL DEFICIT	(261)	(645)
TOTAL LIABILITIES AND EQUITY	13,127	12,746
Noncontrolling interests, Egypt
EQUITY (DEFICIT):
Noncontrolling interest	927	925
Noncontrolling interests, Altus
EQUITY (DEFICIT):
Noncontrolling interest	$ 70	$ 69