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Oil and Gas Exploration and Production Industries Disclosures (Tables)
 12 Months Ended
Dec. 31, 2015
Oil and Gas Exploration and Production Industries Disclosures [Abstract]  
Net Proved and Proved Developed Oil and Gas Reserve Quantities
The following tables set forth EOG's net proved reserves at December 31 for each of the four years in the period ended December 31, 2015, and the changes in the net proved reserves for each of the three years in the period ended December 31, 2015, as estimated by the Engineering and Acquisitions Department of EOG:
NET PROVED RESERVE SUMMARY
 
United
States
 
Trinidad
 
Other
International (1)
 
Total
NET PROVED RESERVES
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Crude Oil (MBbl) (2)
 
 
 
 
 
 
 
Net proved reserves at December 31, 2012
671,029

 
3,028

 
26,761

 
700,818

Revisions of previous estimates
57,668

 
(991
)
 
(6,008
)
 
50,669

Purchases in place
1,097

 
—

 
—

 
1,097

Extensions, discoveries and other additions
230,023

 
—

 
731

 
230,754

Sales in place
(2,337
)
 
—

 
—

 
(2,337
)
Production
(77,431
)
 
(447
)
 
(2,583
)
 
(80,461
)
Net proved reserves at December 31, 2013
880,049

 
1,590

 
18,901

 
900,540

Revisions of previous estimates
28,301

 
99

 
(378
)
 
28,022

Purchases in place
9,705

 
—

 
—

 
9,705

Extensions, discoveries and other additions
319,540

 
—

 
14

 
319,554

Sales in place
(4,967
)
 
—

 
(7,656
)
 
(12,623
)
Production
(102,946
)
 
(350
)
 
(2,152
)
 
(105,448
)
Net proved reserves at December 31, 2014
1,129,682

 
1,339

 
8,729

 
1,139,750

Revisions of previous estimates
(114,924
)
 
(1
)
 
—

 
(114,925
)
Purchases in place
35,922

 
—

 
—

 
35,922

Extensions, discoveries and other additions
141,310

 
63

 
13

 
141,386

Sales in place
(730
)
 
—

 
(10
)
 
(740
)
Production
(103,400
)
 
(332
)
 
(65
)
 
(103,797
)
Net proved reserves at December 31, 2015
1,087,860

 
1,069

 
8,667

 
1,097,596

 
 
 
 
 
 
 
 
Natural Gas Liquids (MBbl) (2)
 

 
 

 
 

 
 

Net proved reserves at December 31, 2012
318,406

 
—

 
1,557

 
319,963

Revisions of previous estimates
12,157

 
—

 
(48
)
 
12,109

Purchases in place
1,202

 
—

 
—

 
1,202

Extensions, discoveries and other additions
69,187

 
—

 
10

 
69,197

Sales in place
(1,471
)
 
—

 
—

 
(1,471
)
Production
(23,479
)
 
—

 
(315
)
 
(23,794
)
Net proved reserves at December 31, 2013
376,002

 
—

 
1,204

 
377,206

Revisions of previous estimates
27,450

 
—

 
(7
)
 
27,443

Purchases in place
1,812

 
—

 
—

 
1,812

Extensions, discoveries and other additions
91,683

 
—

 
—

 
91,683

Sales in place
(956
)
 
—

 
(823
)
 
(1,779
)
Production
(29,061
)
 
—

 
(236
)
 
(29,297
)
Net proved reserves at December 31, 2014
466,930

 
—

 
138

 
467,068

Revisions of previous estimates
(113,290
)
 
—

 
68

 
(113,222
)
Purchases in place
8,251

 
—

 
—

 
8,251

Extensions, discoveries and other additions
49,147

 
—

 
—

 
49,147

Sales in place
(84
)
 
—

 
(187
)
 
(271
)
Production
(28,079
)
 
—

 
(19
)
 
(28,098
)
Net proved reserves at December 31, 2015
382,875

 
—

 
—

 
382,875

 
United
States
 
Trinidad
 
Other
International (1)
 
Total
Natural Gas (Bcf) (3)
 
 
 
 
 
 
 
Net proved reserves at December 31, 2012
4,036.0

 
588.2

 
115.3

 
4,739.5

Revisions of previous estimates
264.0

 
(17.4
)
 
30.7

 
277.3

Purchases in place
5.7

 
—

 
—

 
5.7

Extensions, discoveries and other additions
504.7

 
79.5

 
9.9

 
594.1

Sales in place
(69.4
)
 
—

 
—

 
(69.4
)
Production
(342.3
)
 
(129.6
)
 
(30.5
)
 
(502.4
)
Net proved reserves at December 31, 2013
4,398.7

 
520.7

 
125.4

 
5,044.8

Revisions of previous estimates
252.2

 
12.9

 
5.5

 
270.6

Purchases in place
17.1

 
—

 
—

 
17.1

Extensions, discoveries and other additions
638.3

 
4.5

 
4.7

 
647.5

Sales in place
(52.4
)
 
—

 
(78.7
)
 
(131.1
)
Production
(348.4
)
 
(132.5
)
 
(25.4
)
 
(506.3
)
Net proved reserves at December 31, 2014
4,905.5

 
405.6

 
31.5

 
5,342.6

Revisions of previous estimates
(1,453.1
)
 
16.8

 
5.6

 
(1,430.7
)
Purchases in place
72.3

 
—

 
—

 
72.3

Extensions, discoveries and other additions
306.3

 
21.7

 
4.4

 
332.4

Sales in place
(3.9
)
 
—

 
(11.1
)
 
(15.0
)
Production
(337.3
)
 
(127.5
)
 
(10.9
)
 
(475.7
)
Net proved reserves at December 31, 2015
3,489.8

 
316.6

 
19.5

 
3,825.9

 
 
 
 
 
 
 
 
Oil Equivalents (MBoe) (2)
 

 
 

 
 

 
 

Net proved reserves at December 31, 2012
1,662,108

 
101,060

 
47,530

 
1,810,698

Revisions of previous estimates
113,823

 
(3,892
)
 
(941
)
 
108,990

Purchases in place
3,241

 
—

 
—

 
3,241

Extensions, discoveries and other additions
383,324

 
13,245

 
2,396

 
398,965

Sales in place
(15,375
)
 
—

 
—

 
(15,375
)
Production
(157,955
)
 
(22,049
)
 
(7,972
)
 
(187,976
)
Net proved reserves at December 31, 2013
1,989,166

 
88,364

 
41,013

 
2,118,543

Revisions of previous estimates
97,782

 
2,245

 
541

 
100,568

Purchases in place
14,367

 
—

 
—

 
14,367

Extensions, discoveries and other additions
517,613

 
758

 
796

 
519,167

Sales in place
(14,661
)
 
—

 
(21,602
)
 
(36,263
)
Production
(190,065
)
 
(22,430
)
 
(6,631
)
 
(219,126
)
Net proved reserves at December 31, 2014
2,414,202

 
68,937

 
14,117

 
2,497,256

Revisions of previous estimates
(470,401
)
 
2,802

 
995

 
(466,604
)
Purchases in place
56,215

 
—

 
—

 
56,215

Extensions, discoveries and other additions
241,513

 
3,682

 
736

 
245,931

Sales in place
(1,467
)
 
—

 
(2,039
)
 
(3,506
)
Production
(187,701
)
 
(21,578
)
 
(1,896
)
 
(211,175
)
Net proved reserves at December 31, 2015
2,052,361

 
53,843

 
11,913

 
2,118,117

 
(1)
Other International includes EOG's United Kingdom, China, Canada and Argentina operations.
(2)
Thousand barrels or thousand barrels of oil equivalent, as applicable; oil equivalents include crude oil and condensate, NGLs and natural gas. Oil equivalents are determined using a ratio of 1.0 barrel of crude oil and condensate or NGLs to 6.0 thousand cubic feet of natural gas.
(3)
Billion cubic feet.
Net Proved Developed and Net Proved Undeveloped Oil and Gas Reserve Quantities
 
United
States
 
Trinidad
 
Other
International (1)
 
Total
NET PROVED DEVELOPED RESERVES
 
 
 
 
 
 
 
Crude Oil (MBbl)
 
 
 
 
 
 
 
December 31, 2012
281,167

 
2,377

 
7,106

 
290,650

December 31, 2013
382,517

 
1,505

 
7,034

 
391,056

December 31, 2014
493,694

 
1,339

 
115

 
495,148

December 31, 2015
444,070

 
1,069

 
63

 
445,202

Natural Gas Liquids (MBbl)
 

 
 

 
 

 
 

December 31, 2012
161,482

 
—

 
1,111

 
162,593

December 31, 2013
199,964

 
—

 
896

 
200,860

December 31, 2014
264,611

 
—

 
138

 
264,749

December 31, 2015
205,898

 
—

 
—

 
205,898

Natural Gas (Bcf)
 

 
 

 
 

 
 

December 31, 2012
2,387.5

 
476.7

 
115.3

 
2,979.5

December 31, 2013
2,597.3

 
494.6

 
121.5

 
3,213.4

December 31, 2014
3,102.8

 
396.9

 
28.6

 
3,528.3

December 31, 2015
2,211.2

 
297.6

 
19.5

 
2,528.3

Oil Equivalents (MBoe)
 

 
 

 
 

 
 

December 31, 2012
840,564

 
81,826

 
27,429

 
949,819

December 31, 2013
1,015,359

 
83,933

 
28,184

 
1,127,476

December 31, 2014
1,275,447

 
67,484

 
5,016

 
1,347,947

December 31, 2015
1,018,491

 
50,677

 
3,309

 
1,072,477

NET PROVED UNDEVELOPED RESERVES
 

 
 

 
 

 
 

Crude Oil (MBbl)
 

 
 

 
 

 
 

December 31, 2012
389,862

 
651

 
19,655

 
410,168

December 31, 2013
497,532

 
85

 
11,867

 
509,484

December 31, 2014
635,988

 
—

 
8,614

 
644,602

December 31, 2015
643,790

 
—

 
8,604

 
652,394

Natural Gas Liquids (MBbl)
 

 
 

 
 

 
 

December 31, 2012
156,924

 
—

 
446

 
157,370

December 31, 2013
176,038

 
—

 
308

 
176,346

December 31, 2014
202,319

 
—

 
—

 
202,319

December 31, 2015
176,977

 
—

 
—

 
176,977

Natural Gas (Bcf)
 

 
 

 
 

 
 

December 31, 2012
1,648.5

 
111.5

 
—

 
1,760.0

December 31, 2013
1,801.4

 
26.1

 
3.9

 
1,831.4

December 31, 2014
1,802.7

 
8.7

 
2.9

 
1,814.3

December 31, 2015
1,278.6

 
19.0

 
—

 
1,297.6

Oil Equivalents (MBoe)
 

 
 

 
 

 
 

December 31, 2012
821,544

 
19,234

 
20,101

 
860,879

December 31, 2013
973,807

 
4,431

 
12,829

 
991,067

December 31, 2014
1,138,755

 
1,453

 
9,101

 
1,149,309

December 31, 2015
1,033,870

 
3,166

 
8,604

 
1,045,640

 
(1)
Other International includes EOG's United Kingdom, China, Canada and Argentina operations.
Net Proved Undeveloped Reserves
The following table presents the changes in EOG's total proved undeveloped reserves during 2015, 2014 and 2013 (in MBoe):
 
2015
 
2014
 
2013
 
 
 
 
 
 
Balance at January 1
1,149,309

 
991,067

 
860,879

Extensions and Discoveries
205,152

 
403,713

 
291,345

Revisions
(241,973
)
 
(79,630
)
 
(855
)
Acquisition of Reserves
54,458

 
4,239

 
—

Sale of Reserves
—

 
(10,176
)
 
—

Conversion to Proved Developed Reserves
(121,306
)
 
(159,904
)
 
(160,302
)
Balance at December 31
1,045,640

 
1,149,309

 
991,067
Capitalized Costs Relating to Oil and Gas Producing Activities
The following table sets forth the capitalized costs relating to EOG's crude oil and natural gas producing activities at December 31, 2015 and 2014:
 
2015
 
2014
 
 
 
 
Proved properties
$
49,623,518

 
$
45,169,101

Unproved properties
989,723

 
1,334,431

Total
50,613,241

 
46,503,532

Accumulated depreciation, depletion and amortization
(28,877,593
)
 
(20,212,748
)
Net capitalized costs
$
21,735,648

 
$
26,290,784
Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities
The following table sets forth costs incurred related to EOG's oil and gas activities for the years ended December 31, 2015, 2014 and 2013:
 
United
States
 
Trinidad
 
Other
International (1)
 
Total
2015
 
 
 
 
 
 
 
Acquisition Costs of Properties
 
 
 
 
 
 
 
Unproved
$
133,801

 
$
—

 
$
56

 
$
133,857

Proved
480,617

 
—

 
—

 
480,617

Subtotal
614,418

 
—

 
56

 
614,474

Exploration Costs
206,814

 
22,837

 
23,041

 
252,692

Development Costs (2)
3,847,813

 
102,715

 
110,589

 
4,061,117

Total
$
4,669,045

 
$
125,552

 
$
133,686

 
$
4,928,283

2014
 

 
 

 
 

 
 

Acquisition Costs of Properties
 

 
 

 
 

 
 

Unproved
$
365,915

 
$
—

 
$
4,499

 
$
370,414

Proved
138,772

 
—

 
329

 
139,101

Subtotal
504,687

 
—

 
4,828

 
509,515

Exploration Costs
332,703

 
2,794

 
60,476

 
395,973

Development Costs (3)
6,638,192

 
89,555

 
271,534

 
6,999,281

Total
$
7,475,582

 
$
92,349

 
$
336,838

 
$
7,904,769

2013
 

 
 

 
 

 
 

Acquisition Costs of Properties
 

 
 

 
 

 
 

Unproved
$
411,556

 
$
—

 
$
2,565

 
$
414,121

Proved
120,220

 
—

 
(6
)
 
120,214

Subtotal
531,776

 
—

 
2,559

 
534,335

Exploration Costs
273,788

 
16,060

 
87,331

 
377,179

Development Costs (4)
5,573,260

 
124,231

 
388,886

 
6,086,377

Total
$
6,378,824

 
$
140,291

 
$
478,776

 
$
6,997,891

 
(1)
Other International primarily consists of EOG's United Kingdom, China, Canada and Argentina operations.
(2)
Includes Asset Retirement Costs of $32 million, $15 million and $6 million for the United States, Trinidad and Other International, respectively.  Excludes other property, plant and equipment.
(3)
Includes Asset Retirement Costs of $149 million, $14 million and $33 million for the United States, Trinidad and Other International, respectively.  Excludes other property, plant and equipment.
(4)
Includes Asset Retirement Costs of $84 million and $50 million for the United States and Other International, respectively.  Excludes other property, plant and equipment.
Results of Operations for Oil and Gas Producing Activities
Results of Operations for Oil and Gas Producing Activities (1). The following table sets forth results of operations for oil and gas producing activities for the years ended December 31, 2015, 2014 and 2013:
 
United
States
 
Trinidad
 
Other
International (2)
 
Total
2015
 
 
 
 
 
 
 
Crude Oil and Condensate, Natural Gas Liquids and Natural Gas Revenues
$
5,962,753

 
$
381,761

 
$
58,744

 
$
6,403,258

Other
47,464

 
(3
)
 
448

 
47,909

Total
6,010,217

 
381,758

 
59,192

 
6,451,167

Exploration Costs
139,753

 
2,071

 
7,670

 
149,494

Dry Hole Costs
956

 
5,635

 
8,155

 
14,746

Transportation Costs
838,428

 
1,290

 
9,601

 
849,319

Production Costs
1,486,189

 
28,862

 
66,080

 
1,581,131

Impairments
6,402,908

 
—

 
210,638

 
6,613,546

Depreciation, Depletion and Amortization
3,017,386

 
154,588

 
18,469

 
3,190,443

Income (Loss) Before Income Taxes
(5,875,403
)
 
189,312

 
(261,421
)
 
(5,947,512
)
Income Tax Provision (Benefit)
(2,128,183
)
 
43,739

 
(2,111
)
 
(2,086,555
)
Results of Operations
$
(3,747,220
)
 
$
145,573

 
$
(259,310
)
 
$
(3,860,957
)
2014
 

 
 

 
 

 
 

Crude Oil and Condensate, Natural Gas Liquids and Natural Gas Revenues
$
11,771,777

 
$
512,675

 
$
308,465

 
$
12,592,917

Other
49,950

 
37

 
4,257

 
54,244

Total
11,821,727

 
512,712

 
312,722

 
12,647,161

Exploration Costs
162,434

 
2,185

 
19,769

 
184,388

Dry Hole Costs
25,408

 
—

 
23,082

 
48,490

Transportation Costs
957,522

 
617

 
14,037

 
972,176

Production Costs
1,940,074

 
38,301

 
171,652

 
2,150,027

Impairments
331,792

 
—

 
411,783

 
743,575

Depreciation, Depletion and Amortization
3,571,313

 
188,250

 
122,157

 
3,881,720

Income (Loss) Before Income Taxes
4,833,184

 
283,359

 
(449,758
)
 
4,666,785

Income Tax Provision
1,722,914

 
74,588

 
23,602

 
1,821,104

Results of Operations
$
3,110,270

 
$
208,771

 
$
(473,360
)
 
$
2,845,681

2013
 

 
 

 
 

 
 

Crude Oil and Condensate, Natural Gas Liquids and Natural Gas Revenues
$
9,897,701

 
$
517,482

 
$
340,463

 
$
10,755,646

Other
51,713

 
24

 
4,770

 
56,507

Total
9,949,414

 
517,506

 
345,233

 
10,812,153

Exploration Costs
141,286

 
2,345

 
17,715

 
161,346

Dry Hole Costs
14,276

 
4,478

 
55,901

 
74,655

Transportation Costs
841,567

 
659

 
10,818

 
853,044

Production Costs
1,494,791

 
43,279

 
168,152

 
1,706,222

Impairments
178,718

 
14,274

 
93,949

 
286,941

Depreciation, Depletion and Amortization
3,122,858

 
181,637

 
193,515

 
3,498,010

Income (Loss) Before Income Taxes
4,155,918

 
270,834

 
(194,817
)
 
4,231,935

Income Tax Provision (Benefit)
1,486,445

 
103,313

 
(99,226
)
 
1,490,532

Results of Operations
$
2,669,473

 
$
167,521

 
$
(95,591
)
 
$
2,741,403

 
(1)
Excludes gains or losses on the mark-to-market of financial commodity derivative contracts, gains or losses on sales of reserves and related assets, interest charges and general corporate expenses for each of the three years in the period ended December 31, 2015.
(2)
Other International primarily consists of EOG's United Kingdom, China, Canada and Argentina operations.
Production Costs Per Barrel of Oil Equivalent
The following table sets forth production costs per barrel of oil equivalent, excluding severance/production and ad valorem taxes, for the years ended December 31, 2015, 2014 and 2013:
 
United
States
 
Trinidad
 
Other
International (1)
 
Composite
 
 
 
 
 
 
 
 
Year Ended December 31, 2015
$
5.81

 
$
1.29

 
$
33.78

 
$
5.85

Year Ended December 31, 2014
$
6.44

 
$
1.34

 
$
24.60

 
$
6.46

Year Ended December 31, 2013
$
5.78

 
$
1.36

 
$
20.40

 
$
5.88

 
(1)
Other International primarily consists of EOG's United Kingdom, China, Canada and Argentina operations.
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves Table
The following table sets forth the standardized measure of discounted future net cash flows from projected production of EOG's oil and gas reserves for the years ended December 31, 2015, 2014 and 2013:
 
United
States
 
Trinidad
 
Other
International (1)
 
Total
2015
 
 
 
 
 
 
 
Future cash inflows (2)
$
67,242,928

 
$
954,779

 
$
522,941

 
$
68,720,648

Future production costs
(31,707,743
)
 
(183,607
)
 
(169,505
)
 
(32,060,855
)
Future development costs
(15,579,923
)
 
(140,541
)
 
(65,347
)
 
(15,785,811
)
Future income taxes
(4,400,542
)
 
(215,659
)
 
—

 
(4,616,201
)
Future net cash flows
15,554,720

 
414,972

 
288,089

 
16,257,781

Discount to present value at 10% annual rate
(6,589,253
)
 
(33,848
)
 
(13,284
)
 
(6,636,385
)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves
$
8,965,467

 
$
381,124

 
$
274,805

 
$
9,621,396

2014
 

 
 

 
 

 
 

Future cash inflows (3)
$
144,355,692

 
$
1,615,280

 
$
979,249

 
$
146,950,221

Future production costs
(51,112,604
)
 
(277,844
)
 
(242,845
)
 
(51,633,293
)
Future development costs
(20,270,439
)
 
(84,576
)
 
(139,750
)
 
(20,494,765
)
Future income taxes
(22,725,618
)
 
(460,096
)
 
—

 
(23,185,714
)
Future net cash flows
50,247,031

 
792,764

 
596,654

 
51,636,449

Discount to present value at 10% annual rate
(23,542,990
)
 
(110,228
)
 
(59,813
)
 
(23,713,031
)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves
$
26,704,041

 
$
682,536

 
$
536,841

 
$
27,923,418

2013
 

 
 

 
 

 
 

Future cash inflows (4)
$
119,644,713

 
$
2,082,195

 
$
2,272,591

 
$
123,999,499

Future production costs
(49,099,393
)
 
(315,483
)
 
(751,612
)
 
(50,166,488
)
Future development costs
(17,753,860
)
 
(112,050
)
 
(683,441
)
 
(18,549,351
)
Future income taxes
(15,763,089
)
 
(603,786
)
 
(49,512
)
 
(16,416,387
)
Future net cash flows
37,028,371

 
1,050,876

 
788,026

 
38,867,273

Discount to present value at 10% annual rate
(17,451,470
)
 
(174,236
)
 
91,865

 
(17,533,841
)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves
$
19,576,901

 
$
876,640

 
$
879,891

 
$
21,333,432

 
(1)
Other International includes EOG's United Kingdom, China, Canada and Argentina operations.
(2)
Estimated crude oil prices used to calculate 2015 future cash inflows for the United States, Trinidad and Other International were $49.58, $38.83 and $47.76, respectively. Estimated NGL price used to calculate 2015 future cash inflows for the United States was $15.17. Estimated natural gas prices used to calculate 2015 future cash inflows for the United States, Trinidad and Other International were $2.15, $2.88 and $5.60, respectively.
(3)
Estimated crude oil prices used to calculate 2014 future cash inflows for the United States, Trinidad and Other International were $97.51, $80.60 and $94.09, respectively. Estimated NGL prices used to calculate 2014 future cash inflows for the United States and Other International were $34.29 and $27.03, respectively. Estimated natural gas prices used to calculate 2014 future cash inflows for the United States, Trinidad and Other International were $3.71, $3.71 and $5.14, respectively.
(4)
Estimated crude oil prices used to calculate 2013 future cash inflows for the United States, Trinidad and Other International were $105.91, $94.30 and $98.85, respectively. Estimated NGL prices used to calculate 2013 future cash inflows for the United States and Other International were $29.42 and $40.88, respectively. Estimated natural gas prices used to calculate 2013 future cash inflows for the United States, Trinidad and Other International were $3.50, $3.71 and $3.45, respectively
Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves

Changes in Standardized Measure of Discounted Future Net Cash Flows.  The following table sets forth the changes in the standardized measure of discounted future net cash flows at December 31, for each of the three years in the period ended December 31, 2015:
 
United
States
 
Trinidad
 
Other
International (1)
 
Total
 
 
 
 
 
 
 
 
December 31, 2012
$
15,181,334

 
$
961,070

 
$
773,068

 
$
16,915,472

Sales and transfers of oil and gas produced, net of production costs
(7,561,343
)
 
(473,544
)
 
(161,493
)
 
(8,196,380
)
Net changes in prices and production costs
1,734,058

 
(12,050
)
 
(464,155
)
 
1,257,853

Extensions, discoveries, additions and improved recovery, net of related costs
5,449,531

 
—

 
33,901

 
5,483,432

Development costs incurred
2,792,400

 
67,100

 
96,400

 
2,955,900

Revisions of estimated development cost
892,803

 
(3,539
)
 
101,132

 
990,396

Revisions of previous quantity estimates
1,887,062

 
(60,419
)
 
(32,445
)
 
1,794,198

Accretion of discount
1,895,503

 
147,099

 
91,127

 
2,133,729

Net change in income taxes
(2,772,267
)
 
56,373

 
137,644

 
(2,578,250
)
Purchases of reserves in place
66,359

 
—

 
—

 
66,359

Sales of reserves in place
(140,652
)
 
—

 
—

 
(140,652
)
Changes in timing and other
152,113

 
194,550

 
304,712

 
651,375

December 31, 2013
19,576,901

 
876,640

 
879,891

 
21,333,432

Sales and transfers of oil and gas produced, net of production costs
(8,874,180
)
 
(473,757
)
 
(122,777
)
 
(9,470,714
)
Net changes in prices and production costs
1,481,668

 
(12,079
)
 
(206,412
)
 
1,263,177

Extensions, discoveries, additions and improved recovery, net of related costs
8,074,550

 
3,113

 
6,189

 
8,083,852

Development costs incurred
2,818,800

 
12,800

 
3,500

 
2,835,100

Revisions of estimated development cost
1,696,916

 
9,981

 
95,838

 
1,802,735

Revisions of previous quantity estimates
1,741,918

 
35,001

 
35,613

 
1,812,532

Accretion of discount
2,612,286

 
133,019

 
88,045

 
2,833,350

Net change in income taxes
(3,743,300
)
 
91,438

 
562

 
(3,651,300
)
Purchases of reserves in place
317,785

 
—

 
—

 
317,785

Sales of reserves in place
(189,808
)
 
—

 
(289,071
)
 
(478,879
)
Changes in timing and other
1,190,505

 
6,380

 
45,463

 
1,242,348

December 31, 2014
26,704,041

 
682,536

 
536,841

 
27,923,418

Sales and transfers of oil and gas produced, net of production costs
(3,685,600
)
 
(351,606
)
 
16,489

 
(4,020,717
)
Net changes in prices and production costs
(29,993,699
)
 
(370,503
)
 
(305,148
)
 
(30,669,350
)
Extensions, discoveries, additions and improved recovery, net of related costs
1,028,410

 
47,613

 
19,875

 
1,095,898

Development costs incurred
2,135,800

 
500

 
1,400

 
2,137,700

Revisions of estimated development cost
4,087,093

 
(34,647
)
 
26,935

 
4,079,381

Revisions of previous quantity estimates
(4,084,572
)
 
33,285

 
(587
)
 
(4,051,874
)
Accretion of discount
3,699,330

 
104,464

 
53,685

 
3,857,479

Net change in income taxes
9,550,847

 
177,576

 
—

 
9,728,423

Purchases of reserves in place
123,542

 
—

 
—

 
123,542

Sales of reserves in place
(23,424
)
 
—

 
(13,664
)
 
(37,088
)
Changes in timing and other
(576,301
)
 
91,906

 
(61,021
)
 
(545,416
)
December 31, 2015
$
8,965,467

 
$
381,124

 
$
274,805

 
$
9,621,396

 
(1)
Other International includes EOG's United Kingdom, China, Canada and Argentina operations.