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Supplemental Information On Oil And Gas Operations (Tables) | 12 Months Ended
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Dec. 31, 2014
Supplemental Information On Oil And Gas Operations [Abstract] |
Costs Incurred |
|  | Year Ended December 31, 2014
|  | U.S. |  | Canada |  | Total
|  | (In millions)
Property acquisition costs: |  |  |  |  |  |  |  |  |
Proved properties |  | $ | 5,210 |  | $ | - |  | $ | 5,210
Unproved properties |  |  | 1,176 |  |  | 1 |  |  | 1,177
Exploration costs |  |  | 270 |  |  | 52 |  |  | 322
Development costs |  |  | 4,400 |  |  | 1,063 |  |  | 5,463
Costs incurred |  | $ | 11,056 |  | $ | 1,116 |  | $ | 12,172
|  | Year Ended December 31, 2013
|  | U.S. |  | Canada |  | Total
|  | (In millions)
Property acquisition costs: |  |  |  |  |  |  |  |  |
Proved properties |  | $ | 19 |  | $ | 3 |  | $ | 22
Unproved properties |  |  | 213 |  |  | 3 |  |  | 216
Exploration costs |  |  | 443 |  |  | 152 |  |  | 595
Development costs |  |  | 3,838 |  |  | 1,251 |  |  | 5,089
Costs incurred |  | $ | 4,513 |  | $ | 1,409 |  | $ | 5,922
|  | Year Ended December 31, 2012
|  | U.S. |  | Canada |  | Total
|  | (In millions)
Property acquisition costs: |  |  |  |  |  |  |  |  |
Proved properties |  | $ | 2 |  | $ | 71 |  | $ | 73
Unproved properties |  |  | 1,135 |  |  | 32 |  |  | 1,167
Exploration costs |  |  | 351 |  |  | 315 |  |  | 666
Development costs |  |  | 4,408 |  |  | 1,691 |  |  | 6,099
Costs incurred |  | $ | 5,896 |  | $ | 2,109 |  | $ | 8,005
Capitalized Costs |
|  | December 31, 2014
|  | U.S. |  | Canada |  | Total
|  | (In millions)
Proved properties |  | $ | 59,849 |  | $ | 15,889 |  | $ | 75,738
Unproved properties |  |  | 1,460 |  |  | 1,292 |  |  | 2,752
Total oil & gas properties |  |  | 61,309 |  |  | 17,181 |  |  | 78,490
Accumulated DD&A |  |  | (38,213) |  |  | (11,347) |  |  | (49,560)
Net capitalized costs |  | $ | 23,096 |  | $ | 5,834 |  | $ | 28,930
|  | December 31, 2013
|  | U.S. |  | Canada |  | Total
|  | (In millions)
Proved properties |  | $ | 51,366 |  | $ | 22,629 |  | $ | 73,995
Unproved properties |  |  | 1,277 |  |  | 1,514 |  |  | 2,791
Total oil & gas properties |  |  | 52,643 |  |  | 24,143 |  |  | 76,786
Accumulated DD&A |  |  | (35,848) |  |  | (16,613) |  |  | (52,461)
Net capitalized costs |  | $ | 16,795 |  | $ | 7,530 |  | $ | 24,325
Oil And Gas Properties Not Subject To Amortization |
|  | Costs Incurred In
|  | 2014 |  | 2013 |  | 2012 |  | Prior to 2012 |  | Total
|  | (In millions)
Acquisition costs |  | $ | 973 |  | $ | 127 |  | $ | 140 |  | $ | 650 |  | $ | 1,890
Exploration costs |  |  | 111 |  |  | 76 |  |  | 68 |  |  | 107 |  |  | 362
Development costs |  |  | 103 |  |  | 48 |  |  | 121 |  |  | 69 |  |  | 341
Capitalized interest |  |  | 43 |  |  | 38 |  |  | 30 |  |  | 48 |  |  | 159
Total oil and gas properties not subject to amortization |  | $ | 1,230 |  | $ | 289 |  | $ | 359 |  | $ | 874 |  | $ | 2,752
Results Of Operations |
|  | December 31, 2014
|  | U.S. |  | Canada |  | Total
|  | (In millions)
Oil, gas and NGL sales |  | $ | 7,867 |  | $ | 2,043 |  | $ | 9,910
Lease operating expenses |  |  | (1,559) |  |  | (773) |  |  | (2,332)
General and administrative expenses |  |  | (153) |  |  | (57) |  |  | (210)
Production and property taxes |  |  | (466) |  |  | (37) |  |  | (503)
Depreciation, depletion and amortization |  |  | (2,365) |  |  | (531) |  |  | (2,896)
Gain on sale of assets |  |  | - |  |  | 1,077 |  |  | 1,077
Accretion of asset retirement obligations |  |  | (49) |  |  | (39) |  |  | (88)
Income tax expense |  |  | (1,199) |  |  | (568) |  |  | (1,767)
Results of operations(1) |  | $ | 2,076 |  | $ | 1,115 |  | $ | 3,191
Depreciation, depletion and amortization per Boe |  | $ | 11.41 |  | $ | 13.80 |  | $ | 11.79
(1) In the fourth quarter of 2014, Devon recognized a $1.9 billion Canadian goodwill impairment that is not reflected in
this table.
|  | December 31, 2013
|  | U.S. |  | Canada |  | Total
|  | (In millions)
Oil, gas and NGL sales |  | $ | 5,964 |  | $ | 2,558 |  | $ | 8,522
Lease operating expenses |  |  | (1,257) |  |  | (1,011) |  |  | (2,268)
General and administrative expenses |  |  | (125) |  |  | (77) |  |  | (202)
Production and property taxes |  |  | (380) |  |  | (59) |  |  | (439)
Depreciation, depletion and amortization |  |  | (1,640) |  |  | (825) |  |  | (2,465)
Asset impairments |  |  | (1,110) |  |  | (843) |  |  | (1,953)
Accretion of asset retirement obligations |  |  | (47) |  |  | (64) |  |  | (111)
Income tax benefit (expense) |  |  | (510) |  |  | 88 |  |  | (422)
Results of operations |  | $ | 895 |  | $ | (233) |  | $ | 662
Depreciation, depletion and amortization per Boe |  | $ | 8.69 |  | $ | 12.87 |  | $ | 9.75
|  | December 31, 2012
|  | U.S. |  | Canada |  | Total
|  | (In millions)
Oil, gas and NGL sales |  | $ | 4,679 |  | $ | 2,474 |  | $ | 7,153
Lease operating expenses |  |  | (1,059) |  |  | (1,015) |  |  | (2,074)
General and administrative expenses |  |  | (159) |  |  | (137) |  |  | (296)
Production and property taxes |  |  | (340) |  |  | (55) |  |  | (395)
Depreciation, depletion and amortization |  |  | (1,563) |  |  | (963) |  |  | (2,526)
Asset impairments |  |  | (1,793) |  |  | (163) |  |  | (1,956)
Accretion of asset retirement obligations |  |  | (40) |  |  | (69) |  |  | (109)
Income tax benefit (expense) |  |  | 99 |  |  | (3) |  |  | 96
Results of operations |  | $ | (176) |  | $ | 69 |  | $ | (107)
Depreciation, depletion and amortization per Boe |  | $ | 8.55 |  | $ | 14.41 |  | $ | 10.12
Proved Reserves |
|  | Oil (MMBbls)
|  | U.S. |  | Canada |  | Total
Proved developed and undeveloped reserves: |  |
December 31, 2011 |  |  | 168 |  |  | 80 |  |  | 248
Revisions due to prices |  |  | (1) |  |  | (5) |  |  | (6)
Revisions other than price |  |  | (6) |  |  | (2) |  |  | (8)
Extensions and discoveries |  |  | 65 |  |  | 7 |  |  | 72
Production |  |  | (21) |  |  | (15) |  |  | (36)
December 31, 2012 |  |  | 205 |  |  | 65 |  |  | 270
Revisions due to prices |  |  | 1 |  |  | (1) |  |  | -
Revisions other than price |  |  | (18) |  |  | - |  |  | (18)
Extensions and discoveries |  |  | 69 |  |  | 7 |  |  | 76
Purchase of reserves |  |  | 1 |  |  | - |  |  | 1
Production |  |  | (28) |  |  | (15) |  |  | (43)
Sale of reserves |  |  | (1) |  |  | - |  |  | (1)
December 31, 2013 |  |  | 229 |  |  | 56 |  |  | 285
Revisions due to prices |  |  | (1) |  |  | - |  |  | (1)
Revisions other than price |  |  | (38) |  |  | 1 |  |  | (37)
Extensions and discoveries |  |  | 94 |  |  | 5 |  |  | 99
Purchase of reserves |  |  | 132 |  |  | - |  |  | 132
Production |  |  | (48) |  |  | (10) |  |  | (58)
Sale of reserves |  |  | (17) |  |  | (29) |  |  | (46)
December 31, 2014 |  |  | 351 |  |  | 23 |  |  | 374
Proved developed reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 146 |  |  | 73 |  |  | 219
December 31, 2012 |  |  | 166 |  |  | 62 |  |  | 228
December 31, 2013 |  |  | 194 |  |  | 56 |  |  | 250
December 31, 2014 |  |  | 255 |  |  | 23 |  |  | 278
Proved developed-producing reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 139 |  |  | 65 |  |  | 204
December 31, 2012 |  |  | 155 |  |  | 56 |  |  | 211
December 31, 2013 |  |  | 178 |  |  | 51 |  |  | 229
December 31, 2014 |  |  | 224 |  |  | 19 |  |  | 243
Proved undeveloped reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 22 |  |  | 7 |  |  | 29
December 31, 2012 |  |  | 39 |  |  | 3 |  |  | 42
December 31, 2013 |  |  | 35 |  |  | - |  |  | 35
December 31, 2014 |  |  | 96 |  |  | - |  |  | 96
|  | Bitumen (MMBbls)
|  | U.S. |  | Canada |  | Total
Proved developed and undeveloped reserves: |  |
December 31, 2011 |  |  | - |  |  | 457 |  |  | 457
Revisions due to prices |  |  | - |  |  | 14 |  |  | 14
Revisions other than price |  |  | - |  |  | 7 |  |  | 7
Extensions and discoveries |  |  | - |  |  | 67 |  |  | 67
Production |  |  | - |  |  | (17) |  |  | (17)
December 31, 2012 |  |  | - |  |  | 528 |  |  | 528
Revisions due to prices |  |  | - |  |  | (11) |  |  | (11)
Revisions other than price |  |  | - |  |  | 16 |  |  | 16
Extensions and discoveries |  |  | - |  |  | 38 |  |  | 38
Production |  |  | - |  |  | (19) |  |  | (19)
December 31, 2013 |  |  | - |  |  | 552 |  |  | 552
Revisions due to prices |  |  | - |  |  | (37) |  |  | (37)
Revisions other than price |  |  | - |  |  | 18 |  |  | 18
Extensions and discoveries |  |  | - |  |  | 8 |  |  | 8
Production |  |  | - |  |  | (20) |  |  | (20)
December 31, 2014 |  |  | - |  |  | 521 |  |  | 521
Proved developed reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | - |  |  | 90 |  |  | 90
December 31, 2012 |  |  | - |  |  | 99 |  |  | 99
December 31, 2013 |  |  | - |  |  | 111 |  |  | 111
December 31, 2014 |  |  | - |  |  | 137 |  |  | 137
Proved developed-producing reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | - |  |  | 90 |  |  | 90
December 31, 2012 |  |  | - |  |  | 99 |  |  | 99
December 31, 2013 |  |  | - |  |  | 111 |  |  | 111
December 31, 2014 |  |  | - |  |  | 137 |  |  | 137
Proved undeveloped reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | - |  |  | 367 |  |  | 367
December 31, 2012 |  |  | - |  |  | 429 |  |  | 429
December 31, 2013 |  |  | - |  |  | 441 |  |  | 441
December 31, 2014 |  |  | - |  |  | 384 |  |  | 384
|  | Gas (Bcf)
|  | U.S. |  | Canada |  | Total
Proved developed and undeveloped reserves: |  |
December 31, 2011 |  |  | 9,507 |  |  | 979 |  |  | 10,486
Revisions due to prices |  |  | (831) |  |  | (99) |  |  | (930)
Revisions other than price |  |  | (287) |  |  | (33) |  |  | (320)
Extensions and discoveries |  |  | 1,124 |  |  | 34 |  |  | 1,158
Purchase of reserves |  |  | 2 |  |  | - |  |  | 2
Production |  |  | (752) |  |  | (186) |  |  | (938)
Sale of reserves |  |  | (1) |  |  | (11) |  |  | (12)
December 31, 2012 |  |  | 8,762 |  |  | 684 |  |  | 9,446
Revisions due to prices |  |  | 405 |  |  | 161 |  |  | 566
Revisions other than price |  |  | (299) |  |  | 67 |  |  | (232)
Extensions and discoveries |  |  | 471 |  |  | 19 |  |  | 490
Purchase of reserves |  |  | 1 |  |  | - |  |  | 1
Production |  |  | (709) |  |  | (165) |  |  | (874)
Sale of reserves |  |  | (81) |  |  | (8) |  |  | (89)
December 31, 2013 |  |  | 8,550 |  |  | 758 |  |  | 9,308
Revisions due to prices |  |  | 191 |  |  | 45 |  |  | 236
Revisions other than price |  |  | (299) |  |  | 4 |  |  | (295)
Extensions and discoveries |  |  | 335 |  |  | 8 |  |  | 343
Purchase of reserves |  |  | 457 |  |  | - |  |  | 457
Production |  |  | (660) |  |  | (41) |  |  | (701)
Sale of reserves |  |  | (923) |  |  | (738) |  |  | (1,661)
December 31, 2014 |  |  | 7,651 |  |  | 36 |  |  | 7,687
Proved developed reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 7,957 |  |  | 951 |  |  | 8,908
December 31, 2012 |  |  | 7,391 |  |  | 679 |  |  | 8,070
December 31, 2013 |  |  | 7,707 |  |  | 752 |  |  | 8,459
December 31, 2014 |  |  | 6,948 |  |  | 36 |  |  | 6,984
Proved developed-producing reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 7,409 |  |  | 862 |  |  | 8,271
December 31, 2012 |  |  | 7,091 |  |  | 624 |  |  | 7,715
December 31, 2013 |  |  | 7,425 |  |  | 680 |  |  | 8,105
December 31, 2014 |  |  | 6,746 |  |  | 34 |  |  | 6,780
Proved undeveloped reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 1,550 |  |  | 28 |  |  | 1,578
December 31, 2012 |  |  | 1,371 |  |  | 5 |  |  | 1,376
December 31, 2013 |  |  | 843 |  |  | 6 |  |  | 849
December 31, 2014 |  |  | 703 |  |  | - |  |  | 703
|  | Natural Gas Liquids (MMBbls)
|  | U.S. |  | Canada |  | Total
Proved developed and undeveloped reserves: |  |
December 31, 2011 |  |  | 525 |  |  | 27 |  |  | 552
Revisions due to prices |  |  | (19) |  |  | (5) |  |  | (24)
Revisions other than price |  |  | (13) |  |  | - |  |  | (13)
Extensions and discoveries |  |  | 114 |  |  | 2 |  |  | 116
Production |  |  | (36) |  |  | (4) |  |  | (40)
December 31, 2012 |  |  | 571 |  |  | 20 |  |  | 591
Revisions due to prices |  |  | 8 |  |  | 3 |  |  | 11
Revisions other than price |  |  | (50) |  |  | 3 |  |  | (47)
Extensions and discoveries |  |  | 64 |  |  | 1 |  |  | 65
Production |  |  | (41) |  |  | (4) |  |  | (45)
December 31, 2013 |  |  | 552 |  |  | 23 |  |  | 575
Revisions due to prices |  |  | 7 |  |  | 1 |  |  | 8
Revisions other than price |  |  | 2 |  |  | - |  |  | 2
Extensions and discoveries |  |  | 47 |  |  | - |  |  | 47
Purchase of reserves |  |  | 57 |  |  | - |  |  | 57
Production |  |  | (50) |  |  | (1) |  |  | (51)
Sale of reserves |  |  | (37) |  |  | (23) |  |  | (60)
December 31, 2014 |  |  | 578 |  |  | - |  |  | 578
Proved developed reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 402 |  |  | 26 |  |  | 428
December 31, 2012 |  |  | 431 |  |  | 20 |  |  | 451
December 31, 2013 |  |  | 468 |  |  | 23 |  |  | 491
December 31, 2014 |  |  | 486 |  |  | - |  |  | 486
Proved developed-producing reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 372 |  |  | 24 |  |  | 396
December 31, 2012 |  |  | 406 |  |  | 19 |  |  | 425
December 31, 2013 |  |  | 442 |  |  | 21 |  |  | 463
December 31, 2014 |  |  | 467 |  |  | - |  |  | 467
Proved undeveloped reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 123 |  |  | 1 |  |  | 124
December 31, 2012 |  |  | 140 |  |  | - |  |  | 140
December 31, 2013 |  |  | 84 |  |  | - |  |  | 84
December 31, 2014 |  |  | 92 |  |  | - |  |  | 92
|  | Total (MMBoe) (1)
|  | U.S. |  | Canada |  | Total
Proved developed and undeveloped reserves: |  |
December 31, 2011 |  |  | 2,278 |  |  | 727 |  |  | 3,005
Revisions due to prices |  |  | (159) |  |  | (12) |  |  | (171)
Revisions other than price |  |  | (67) |  |  | (1) |  |  | (68)
Extensions and discoveries |  |  | 367 |  |  | 82 |  |  | 449
Production |  |  | (183) |  |  | (67) |  |  | (250)
Sale of reserves |  |  | - |  |  | (2) |  |  | (2)
December 31, 2012 |  |  | 2,236 |  |  | 727 |  |  | 2,963
Revisions due to prices |  |  | 76 |  |  | 18 |  |  | 94
Revisions other than price |  |  | (117) |  |  | 29 |  |  | (88)
Extensions and discoveries |  |  | 212 |  |  | 49 |  |  | 261
Purchase of reserves |  |  | 1 |  |  | - |  |  | 1
Production |  |  | (189) |  |  | (64) |  |  | (253)
Sale of reserves |  |  | (14) |  |  | (1) |  |  | (15)
December 31, 2013 |  |  | 2,205 |  |  | 758 |  |  | 2,963
Revisions due to prices |  |  | 38 |  |  | (29) |  |  | 9
Revisions other than price |  |  | (86) |  |  | 21 |  |  | (65)
Extensions and discoveries |  |  | 197 |  |  | 14 |  |  | 211
Purchase of reserves |  |  | 265 |  |  | - |  |  | 265
Production |  |  | (207) |  |  | (39) |  |  | (246)
Sale of reserves |  |  | (207) |  |  | (176) |  |  | (383)
December 31, 2014 |  |  | 2,205 |  |  | 549 |  |  | 2,754
Proved developed reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 1,875 |  |  | 348 |  |  | 2,223
December 31, 2012 |  |  | 1,829 |  |  | 294 |  |  | 2,123
December 31, 2013 |  |  | 1,947 |  |  | 315 |  |  | 2,262
December 31, 2014 |  |  | 1,900 |  |  | 165 |  |  | 2,065
Proved developed-producing reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 1,746 |  |  | 323 |  |  | 2,069
December 31, 2012 |  |  | 1,743 |  |  | 278 |  |  | 2,021
December 31, 2013 |  |  | 1,857 |  |  | 297 |  |  | 2,154
December 31, 2014 |  |  | 1,815 |  |  | 162 |  |  | 1,977
Proved undeveloped reserves as of: |  |  |  |  |  |  |  |  |
December 31, 2011 |  |  | 403 |  |  | 379 |  |  | 782
December 31, 2012 |  |  | 407 |  |  | 433 |  |  | 840
December 31, 2013 |  |  | 258 |  |  | 443 |  |  | 701
December 31, 2014 |  |  | 305 |  |  | 384 |  |  | 689
_______________________ (1)Gas reserves are converted to Boe at the rate of six Mcf per Bbl of oil, based upon the approximate relative energy content of gas and oil. This rate is not necessarily indicative of the relationship of natural gas and oil prices. Bitumen and natural gas liquids reserves are converted to Boe on a one-to-one basis with oil.
Proved Undeveloped Reserves |
|  | U.S. |  | Canada |  | Total
Proved undeveloped reserves as of December 31, 2013 |  |  | 258 |  |  | 443 |  |  | 701
Extensions and discoveries |  |  | 153 |  |  | 8 |  |  | 161
Revisions due to prices |  |  | (1) |  |  | (34) |  |  | (35)
Revisions other than price |  |  | (61) |  |  | 18 |  |  | (43)
Sale of reserves |  |  | (4) |  |  | (2) |  |  | (6)
Conversion to proved developed reserves |  |  | (40) |  |  | (49) |  |  | (89)
Proved undeveloped reserves as of December 31, 2014 |  |  | 305 |  |  | 384 |  |  | 689
Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves |
|  | Year Ended December 31, 2014
|  | U.S. |  | Canada |  | Total
|  | (In millions)
Future cash inflows |  | $ | 75,847 |  | $ | 31,371 |  | $ | 107,218
Future costs: |  |  |  |  |  |  |  |  |
Development |  |  | (7,168) |  |  | (3,619) |  |  | (10,787)
Production |  |  | (29,740) |  |  | (14,232) |  |  | (43,972)
Future income tax expense |  |  | (11,021) |  |  | (3,026) |  |  | (14,047)
Future net cash flow |  |  | 27,918 |  |  | 10,494 |  |  | 38,412
10% discount to reflect timing of cash flows |  |  | (12,819) |  |  | (5,119) |  |  | (17,938)
Standardized measure of discounted future net cash flows |  | $ | 15,099 |  | $ | 5,375 |  | $ | 20,474
|  | Year Ended December 31, 2013
|  | U.S. |  | Canada |  | Total
|  | (In millions)
Future cash inflows |  | $ | 61,983 |  | $ | 33,305 |  | $ | 95,288
Future costs: |  |  |  |  |  |  |  |  |
Development |  |  | (5,448) |  |  | (5,308) |  |  | (10,756)
Production |  |  | (26,663) |  |  | (15,709) |  |  | (42,372)
Future income tax expense |  |  | (9,046) |  |  | (2,327) |  |  | (11,373)
Future net cash flow |  |  | 20,826 |  |  | 9,961 |  |  | 30,787
10% discount to reflect timing of cash flows |  |  | (10,346) |  |  | (4,700) |  |  | (15,046)
Standardized measure of discounted future net cash flows |  | $ | 10,480 |  | $ | 5,261 |  | $ | 15,741
|  | Year Ended December 31, 2012
|  | U.S. |  | Canada |  | Total
|  | (In millions)
Future cash inflows |  | $ | 55,297 |  | $ | 33,570 |  | $ | 88,867
Future costs: |  |  |  |  |  |  |  |  |
Development |  |  | (6,556) |  |  | (6,211) |  |  | (12,767)
Production |  |  | (24,265) |  |  | (16,611) |  |  | (40,876)
Future income tax expense |  |  | (6,542) |  |  | (1,992) |  |  | (8,534)
Future net cash flow |  |  | 17,934 |  |  | 8,756 |  |  | 26,690
10% discount to reflect timing of cash flows |  |  | (9,036) |  |  | (4,433) |  |  | (13,469)
Standardized measure of discounted future net cash flows |  | $ | 8,898 |  | $ | 4,323 |  | $ | 13,221
Schedule Of Principal Changes In The Standardized Measure Of Discounted Future Net Cash Flows Attributable To Proved Reserves |
|  | Year Ended December 31,
|  | 2014 |  | 2013 |  | 2012
|  | (In millions)
Beginning balance |  | $ | 15,741 |  | $ | 13,221 |  | $ | 17,844
Net changes in prices and production costs |  |  | 2,561 |  |  | 3,018 |  |  | (9,889)
Oil, bitumen, gas and NGL sales, net of production costs |  |  | (6,865) |  |  | (5,613) |  |  | (4,388)
Changes in estimated future development costs |  |  | (768) |  |  | 399 |  |  | (1,094)
Extensions and discoveries, net of future development costs |  |  | 4,836 |  |  | 4,047 |  |  | 4,669
Purchase of reserves |  |  | 6,422 |  |  | 14 |  |  | 18
Sales of reserves in place |  |  | (2,384) |  |  | (44) |  |  | (25)
Revisions of quantity estimates |  |  | (746) |  |  | (1,040) |  |  | 162
Previously estimated development costs incurred during the period |  |  | 1,933 |  |  | 1,986 |  |  | 1,321
Accretion of discount |  |  | 1,746 |  |  | 1,940 |  |  | 1,420
Other, primarily changes in timing and foreign exchange rates |  |  | (107) |  |  | (583) |  |  | 113
Net change in income taxes |  |  | (1,895) |  |  | (1,604) |  |  | 3,070
Ending balance |  | $ | 20,474 |  | $ | 15,741 |  | $ | 13,221

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