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SUPPLEMENTAL OIL AND GAS DISCLOSURES (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2020
Extractive Industries [Abstract]  
Revenue and Direct Cost Information Relating to Company's Oil and Gas Exploration and Production Activities
The following table sets forth revenue and direct cost information relating to the Company’s oil and gas exploration and production activities. Apache has no long-term agreements to purchase oil or gas production from foreign governments or authorities.
United
States
Egypt(1)
North SeaOther
International
Total(1)
 (In millions, except per boe)
2020
Oil and gas production revenues$1,764 $1,390 $883 $— $4,037 
Operating cost:
Depreciation, depletion, and amortization(2)
726 540 377 — 1,643 
Asset retirement obligation accretion32 — 73 — 105 
Lease operating expenses400 424 305 — 1,129 
Gathering, processing, and transmission291 38 50 — 379 
Exploration expenses168 63 28 15 274 
Impairments related to oil and gas properties3,938 374 7 — 4,319 
Production taxes(3)
106 — — — 106 
Income tax(818)(22)17 — (823)
4,843 1,417 857 15 7,132 
Results of operations$(3,079)$(27)$26 $(15)$(3,095)
2019
Oil and gas production revenues$2,763 $2,276 $1,276 $— $6,315 
Operating cost:
Depreciation, depletion, and amortization(2)
1,508 641 363 — 2,512 
Asset retirement obligation accretion29 — 76 — 105 
Lease operating expenses645 484 320 — 1,449 
Gathering, processing, and transmission299 40 45 — 384 
Exploration expenses688 100 2 15 805 
Impairments related to oil and gas properties1,633 — — — 1,633 
Production taxes(3)
191 — — — 191 
Income tax(468)455 188 — 175 
4,525 1,720 994 15 7,254 
Results of operations$(1,762)$556 $282 $(15)$(939)
2018
Oil and gas production revenues$3,279 $2,748 $1,321 $— $7,348 
Operating cost:
Depreciation, depletion, and amortization(2)
1,206 688 371 — 2,265 
Asset retirement obligation accretion32 — 75 — 107 
Lease operating expenses670 428 341 — 1,439 
Gathering, processing, and transmission282 47 42 — 371 
Exploration expenses219 88 192 4 503 
Impairments related to oil and gas properties265 63 10 — 338 
Production taxes(3)
203 — — — 203 
Income tax87 645 116 — 848 
2,964 1,959 1,147 4 6,074 
Results of operations$315 $789 $174 $(4)$1,274 
(1)Includes a noncontrolling interest in Egypt.
(2)Reflects DD&A of capitalized costs of oil and gas properties and, therefore, does not agree with DD&A reflected on Note 17—Business Segment Information.
(3)Reflects only amounts directly related to oil and gas producing properties and, therefore, does not agree with taxes other than income reflected on Note 17—Business Segment Information.
Costs Incurred in Oil and Gas Property Acquisitions, Exploration and Development Activities
Costs Incurred in Oil and Gas Property Acquisitions, Exploration, and Development Activities
United
States
Egypt(2)
North SeaOther
International
Total(2)
 (In millions)
2020
Acquisitions:
Proved$— $7 $— $— $7 
Unproved4 — — — 4 
Exploration8 102 68 150 328 
Development332 378 162 — 872 
Costs incurred(1)
$344 $487 $230 $150 $1,211 
(1) Includes capitalized interest and asset retirement costs as follows:
Capitalized interest$— $— $— $3 $3 
Asset retirement costs9 — 29 — 38 
2019
Acquisitions:
Proved$3 $5 $— $— $8 
Unproved47 10 — — 57 
Exploration162 139 62 105 468 
Development1,500 374 119 3 1,996 
Costs incurred(1)
$1,712 $528 $181 $108 $2,529 
(1) Includes capitalized interest and asset retirement costs as follows:
Capitalized interest$23 $— $5 $4 $32 
Asset retirement costs14 — (111)— (97)
2018
Acquisitions:
Proved$— $6 $— $— $6 
Unproved111 16 — — 127 
Exploration640 175 113 12 940 
Development1,791 457 133 — 2,381 
Costs incurred(1)
$2,542 $654 $246 $12 $3,454 
(1) Includes capitalized interest and asset retirement costs as follows:
Capitalized interest$23 $— $11 $2 $36 
Asset retirement costs93 — (62)— 31 
(2) Includes a noncontrolling interest in Egypt.
The following table sets forth the capitalized costs and associated accumulated depreciation, depletion, and amortization relating to the Company’s oil and gas acquisition, exploration, and development activities:
United
States
Egypt(1)
North
Sea		Other
International
Total(1)
 (In millions)
2020
Proved properties$20,343 $12,069 $8,805 $— $41,217 
Unproved properties348 77 42 135 602 
20,691 12,146 8,847 135 41,819 
Accumulated DD&A(16,252)(10,290)(7,081)— (33,623)
$4,439 $1,856 $1,766 $135 $8,196 
2019
Proved properties$20,291 $11,614 $8,635 $— $40,540 
Unproved properties509 109 10 38 666 
20,800 11,723 8,645 38 41,206 
Accumulated DD&A(11,783)(9,377)(6,700)— (27,860)
$9,017 $2,346 $1,945 $38 $13,346 
(1)Includes a noncontrolling interest in Egypt..
Proved Reserve Data There are numerous uncertainties inherent in estimating quantities of proved reserves and projecting future rates of production and timing of development expenditures. The reserve data in the following tables only represent estimates and should not be construed as being exact.
 Crude Oil and Condensate
 United
States
Egypt(1)
North
Sea
Total(1)
(Thousands of barrels)
Proved developed reserves:
December 31, 2017304,279 124,568 92,598 521,445 
December 31, 2018300,484 110,014 104,491 514,989 
December 31, 2019278,145 103,573 101,712 483,430 
December 31, 2020206,936 95,981 86,566 389,483 
Proved undeveloped reserves:
December 31, 201731,904 16,198 14,013 62,115 
December 31, 201845,182 9,484 11,278 65,944 
December 31, 201946,716 10,831 10,049 67,596 
December 31, 202025,516 11,228 7,273 44,017 
Total proved reserves:
Balance December 31, 2017336,183 140,766 106,611 583,560 
Extensions, discoveries and other additions61,976 22,473 15,682 100,131 
Purchases of minerals in-place140 — — 140 
Revisions of previous estimates(14,334)(9,556)10,613 (13,277)
Production(38,252)(34,185)(17,137)(89,574)
Sales of minerals in-place(47)— — (47)
Balance December 31, 2018345,666 119,498 115,769 580,933 
Extensions, discoveries and other additions52,297 21,039 9,017 82,353 
Revisions of previous estimates(16,446)4,752 5,132 (6,562)
Production(38,344)(30,885)(18,157)(87,386)
Sales of minerals in-place(18,312)— — (18,312)
Balance December 31, 2019324,861 114,404 111,761 551,026 
Extensions, discoveries and other additions17,858 17,855 5,275 40,988 
Revisions of previous estimates(69,247)2,541 (4,756)(71,462)
Production(32,299)(27,591)(18,441)(78,331)
Sales of minerals in-place(8,721)— — (8,721)
Balance December 31, 2020232,452 107,209 93,839 433,500 
(1)Includes proved reserves of 36 MMbbls, 38 MMbbls, 40 MMbbls, and 47 MMbbls as of December 31, 2020, 2019, 2018, and 2017, respectively, attributable to a noncontrolling interest in Egypt.
 Natural Gas Liquids
 United
States
Egypt(1)
North
Sea
Total(1)
(Thousands of barrels)
Proved developed reserves:
December 31, 2017171,005 685 2,025 173,715 
December 31, 2018197,574 502 1,938 200,014 
December 31, 2019158,794 667 2,317 161,778 
December 31, 2020150,599 716 2,053 153,368 
Proved undeveloped reserves:
December 31, 201729,559 39 353 29,951 
December 31, 201833,796 60 631 34,487 
December 31, 201923,569 90 660 24,319 
December 31, 202015,141 126 320 15,587 
Total proved reserves:
Balance December 31, 2017200,564 724 2,378 203,666 
Extensions, discoveries and other additions60,990 144 1,444 62,578 
Purchases of minerals in-place40 — — 40 
Revisions of previous estimates(9,250)31 (819)(10,038)
Production(20,969)(337)(434)(21,740)
Sales of minerals in-place(5)— — (5)
Balance December 31, 2018231,370 562 2,569 234,501 
Extensions, discoveries and other additions41,343 27 697 42,067 
Revisions of previous estimates(32,569)508 345 (31,716)
Production(24,959)(340)(634)(25,933)
Sales of minerals in-place(32,822)— — (32,822)
Balance December 31, 2019182,363 757 2,977 186,097 
Extensions, discoveries and other additions11,435 97 312 11,844 
Revisions of previous estimates(469)264 (207)(412)
Production(27,133)(276)(709)(28,118)
Sales of minerals in-place(456)— — (456)
Balance December 31, 2020165,740 842 2,373 168,955 
(1)  Includes proved reserves of 281 Mbbls, 252 Mbbls, 187 Mbbls, and 241 Mbbls as of December 31, 2020, 2019, 2018, and 2017, respectively, attributable to a noncontrolling interest in Egypt.
 Natural Gas
 United
States
Egypt(1)
North
Sea
Total(1)
(Millions of cubic feet)
Proved developed reserves:
December 31, 20171,347,009 540,667 83,342 1,971,018 
December 31, 20181,626,403 476,132 95,347 2,197,882 
December 31, 2019945,938 433,382 106,329 1,485,649 
December 31, 20201,052,756 409,035 68,159 1,529,950 
Proved undeveloped reserves:
December 31, 2017297,226 47,255 11,063 355,544 
December 31, 2018267,090 33,006 15,804 315,900 
December 31, 2019115,040 24,704 16,604 156,348 
December 31, 202076,504 12,572 8,341 97,417 
Total proved reserves:
Balance December 31, 20171,644,235 587,922 94,405 2,326,562 
Extensions, discoveries and other additions704,135 79,394 55,274 838,803 
Purchases of minerals in-place906 — — 906 
Revisions of previous estimates(239,204)(38,892)(21,933)(300,029)
Production(216,538)(119,286)(16,595)(352,419)
Sales of minerals in-place(41)— — (41)
Balance December 31, 20181,893,493 509,138 111,151 2,513,782 
Extensions, discoveries and other additions249,205 34,758 27,711 311,674 
Revisions of previous estimates(509,753)18,570 4,015 (487,168)
Production(233,447)(104,380)(19,944)(357,771)
Sales of minerals in-place(338,520)— — (338,520)
Balance December 31, 20191,060,978 458,086 122,933 1,641,997 
Extensions, discoveries and other additions60,965 83,718 8,140 152,823 
Revisions of previous estimates215,166 (19,849)(33,541)161,776 
Production(205,594)(100,348)(21,032)(326,974)
Sales of minerals in-place(2,255)— — (2,255)
Balance December 31, 20201,129,260 421,607 76,500 1,627,367 
(1) Includes proved reserves of 141 Bcf, 153 Bcf, 170 Bcf, and 196 Bcf as of December 31, 2020, 2019, 2018, and 2017, respectively, attributable to a noncontrolling interest in Egypt.
 Total Equivalent Reserves
 United
States
Egypt(1)
North
Sea
Total(1)
(Thousands barrels of oil equivalent)
Proved developed reserves:
December 31, 2017699,786 215,364 108,513 1,023,663 
December 31, 2018769,125 189,871 122,320 1,081,316 
December 31, 2019594,595 176,470 121,751 892,816 
December 31, 2020532,994 164,870 99,979 797,843 
Proved undeveloped reserves:
December 31, 2017111,001 24,112 16,210 151,323 
December 31, 2018123,493 15,045 14,543 153,081 
December 31, 201989,458 15,038 13,476 117,972 
December 31, 202053,408 13,449 8,983 75,840 
Total proved reserves:
Balance December 31, 2017810,787 239,476 124,723 1,174,986 
Extensions, discoveries and other additions240,322 35,849 26,338 302,509 
Purchases of minerals in-place331 — — 331 
Revisions of previous estimates(63,451)(16,007)6,139 (73,319)
Production(95,312)(54,402)(20,337)(170,051)
Sales of minerals in-place(59)— — (59)
Balance December 31, 2018892,618 204,916 136,863 1,234,397 
Extensions, discoveries and other additions135,174 26,859 14,333 176,366 
Revisions of previous estimates(133,974)8,355 6,146 (119,473)
Production(102,211)(48,622)(22,115)(172,948)
Sales of minerals in-place(107,554)— — (107,554)
Balance December 31, 2019684,053 191,508 135,227 1,010,788 
Extensions, discoveries and other additions39,454 31,905 6,944 78,303 
Revisions of previous estimates(33,854)(502)(10,554)(44,910)
Production(93,698)(44,592)(22,655)(160,945)
Sales of minerals in-place(9,553)— — (9,553)
Balance December 31, 2020586,402 178,319 108,962 873,683 
(1) Includes include total proved reserves of 59 MMboe, 64 MMboe, 68 MMboe, and 80 MMboe as of December 31, 2020, 2019, 2018, and 2017, respectively, attributable to a noncontrolling interest in Egypt.
Unaudited Information of Future Net Cash Flows For Oil and Gas Reserves, Net of Income Tax Expense
The following table sets forth unaudited information concerning future net cash flows for proved oil and gas reserves, net of income tax expense. Income tax expense has been computed using expected future tax rates and giving effect to tax deductions and credits available, under current laws, and which relate to oil and gas producing activities. This information does not purport to present the fair market value of the Company’s oil and gas assets, but does present a standardized disclosure concerning possible future net cash flows that would result under the assumptions used.
United
States
Egypt(1)
North
Sea
Total(1)
 (In millions)
2020
Cash inflows$12,537 $5,560 $4,122 $22,219 
Production costs(6,244)(1,704)(2,388)(10,336)
Development costs(1,555)(633)(2,448)(4,636)
Income tax expense— (1,096)316 (780)
Net cash flows4,738 2,127 (398)6,467 
10 percent discount rate(1,829)(437)1,111 (1,155)
Discounted future net cash flows(2)
$2,909 $1,690 $713 $5,312 
2019
Cash inflows$21,694 $8,306 $7,454 $37,454 
Production costs(10,642)(1,847)(2,730)(15,219)
Development costs(1,740)(707)(2,651)(5,098)
Income tax expense(27)(1,930)(784)(2,741)
Net cash flows9,285 3,822 1,289 14,396 
10 percent discount rate(4,003)(808)297 (4,514)
Discounted future net cash flows(2)
$5,282 $3,014 $1,586 $9,882 
2018
Cash inflows$29,906 $9,866 $9,206 $48,978 
Production costs(13,699)(1,799)(2,588)(18,086)
Development costs(2,150)(792)(2,714)(5,656)
Income tax expense(19)(2,455)(1,352)(3,826)
Net cash flows14,038 4,820 2,552 21,410 
10 percent discount rate(6,516)(1,066)(107)(7,689)
Discounted future net cash flows(2)
$7,522 $3,754 $2,445 $13,721 
(1)Includes discounted future net cash flows of approximately $563 million, $1.0 billion, and $1.3 billion as of December 31, 2020, 2019, and 2018, respectively, attributable to a noncontrolling interest in Egypt.
(2)Estimated future net cash flows before income tax expense, discounted at 10 percent per annum, totaled approximately $7.1 billion, $12.4 billion, and $16.9 billion as of December 31, 2020, 2019, and 2018, respectively.
Principal Sources of Change In Discounted Future Net Cash Flows
The following table sets forth the principal sources of change in the discounted future net cash flows:
 For the Year Ended December 31,
 202020192018
 (In millions)
Sales, net of production costs$(2,422)$(4,291)$(5,335)
Net change in prices and production costs(5,753)(3,034)3,902 
Discoveries and improved recovery, net of related costs751 2,042 3,889 
Change in future development costs20 (75)47 
Previously estimated development costs incurred during the period576 983 910 
Revision of quantities(418)(741)(648)
Purchases of minerals in-place— — 6 
Accretion of discount1,236 1,693 1,216 
Change in income taxes1,533 720 (1,125)
Sales of minerals in-place(104)(817)(1)
Change in production rates and other11 (319)777 
$(4,570)$(3,839)$3,638