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v3.20.4

Supplemental Information on Oil and Gas Operations (Unaudited) (Proved Developed and Undeveloped Reserves) (Details) MBbls in Thousands, Mcf in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 MMBoe MBbls Mcf | Dec. 31, 2019 MMBoe MBbls Mcf | Dec. 31, 2018 MMBoe MBbls Mcf | Dec. 31, 2017 MMBoe MBbls Mcf
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance | MMBoe | [1] | 757 | 823 | 787 |
Proved developed and undeveloped reserves, revisions due to prices | MMBoe | [1] | (78) | (28) | 15 |
Proved developed and undeveloped reserves, revisions other than price | MMBoe | [1] | 55 | (31) | (53) |
Proved developed and undeveloped reserves, extensions and discoveries | MMBoe | [1] | 135 | 160 | 206 |
Proved developed and undeveloped reserves, purchase of reserves | MMBoe | [1] | 7 | 6 |  |
Proved developed and undeveloped reserves, production | MMBoe | [1] | (122) | (119) | (108) |
Proved developed and undeveloped reserves, sale of reserves | MMBoe | [1] | (2) | (54) | (24) |
Proved developed and undeveloped reserves, ending balance | MMBoe | [1] | 752 | 757 | 823 |
Proved developed reserves | MMBoe | [1] | 574 | 589 | 600 | 585
Proved developed producing reserves | MMBoe | [1] | 564 | 578 | 582 | 554
Proved undeveloped reserves | MMBoe | [1] | 178 | 168 | 223 | 202
Conversion rate of gas reserves from barrels of oil to Boe |  | 6 |  |  |
Oil [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance |  | 276 | 296 | 254 |
Proved developed and undeveloped reserves, revisions due to prices |  | (26) | (7) | 12 |
Proved developed and undeveloped reserves, revisions other than price |  | 18 | (13) | (10) |
Proved developed and undeveloped reserves, extensions and discoveries |  | 71 | 76 | 93 |
Proved developed and undeveloped reserves, purchase of reserves |  | 1 | 3 |  |
Proved developed and undeveloped reserves, production |  | (57) | (55) | (47) |
Proved developed and undeveloped reserves, sale of reserves |  | (1) | (24) | (6) |
Proved developed and undeveloped reserves, ending balance |  | 282 | 276 | 296 |
Proved developed reserves |  | 194 | 198 | 196 | 175
Proved developed producing reserves |  | 190 | 191 | 188 | 163
Proved undeveloped reserves |  | 88 | 78 | 100 | 79
Natural Gas [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance | Mcf |  | 1,621 | 1,802 | 1,810 |
Proved developed and undeveloped reserves, revisions due to prices | Mcf |  | (209) | (86) | 7 |
Proved developed and undeveloped reserves, revisions other than price | Mcf |  | 119 | (50) | (102) |
Proved developed and undeveloped reserves, extensions and discoveries | Mcf |  | 188 | 269 | 358 |
Proved developed and undeveloped reserves, purchase of reserves | Mcf |  | 19 | 7 |  |
Proved developed and undeveloped reserves, production | Mcf |  | (221) | (219) | (206) |
Proved developed and undeveloped reserves, sale of reserves | Mcf |  | (5) | (102) | (65) |
Proved developed and undeveloped reserves, ending balance | Mcf |  | 1,512 | 1,621 | 1,802 |
Proved developed reserves | Mcf |  | 1,244 | 1,344 | 1,427 | 1,455
Proved developed producing reserves | Mcf |  | 1,223 | 1,327 | 1,394 | 1,384
Proved undeveloped reserves | Mcf |  | 268 | 277 | 375 | 355
Natural Gas Liquids [Member] |  |  |  |  |
Reserve Quantities [Line Items] |  |  |  |  |
Proved developed and undeveloped reserves, beginning balance |  | 211 | 227 | 231 |
Proved developed and undeveloped reserves, revisions due to prices |  | (17) | (6) | 2 |
Proved developed and undeveloped reserves, revisions other than price |  | 17 | (9) | (27) |
Proved developed and undeveloped reserves, extensions and discoveries |  | 33 | 39 | 54 |
Proved developed and undeveloped reserves, purchase of reserves |  | 3 | 1 |  |
Proved developed and undeveloped reserves, production |  | (28) | (28) | (26) |
Proved developed and undeveloped reserves, sale of reserves |  | (1) | (13) | (7) |
Proved developed and undeveloped reserves, ending balance |  | 218 | 211 | 227 |
Proved developed reserves |  | 173 | 167 | 166 | 168
Proved developed producing reserves |  | 171 | 165 | 162 | 160
Proved undeveloped reserves |  | 45 | 44 | 61 | 63
[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. NGL reserves are converted to Boe on a one-to-one basis with oil. The conversion rates are not necessarily indicative of the relationship of oil, natural gas and NGL prices.

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