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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, 2021
MMBoe
MBbls
Mcf
Dec. 31, 2020
MMBoe
MBbls
Mcf
Dec. 31, 2019
MMBoe
MBbls
Mcf
Dec. 31, 2018
MMBoe
MBbls
Mcf
Reserve Quantities [Line Items]        
Proved developed and undeveloped reserves, beginning balance | MMBoe [1] 752 757 823  
Proved developed and undeveloped reserves, revisions due to prices | MMBoe [1] 155 (78) (28)  
Proved developed and undeveloped reserves, revisions other than price | MMBoe [1] 43 55 (31)  
Proved developed and undeveloped reserves, extensions and discoveries | MMBoe [1] 228 135 160  
Proved developed and undeveloped reserves, extensions and discoveries | MMBoe [1] 663 7 6  
Proved developed and undeveloped reserves, production | MMBoe [1] (209) (122) (119)  
Proved developed and undeveloped reserves, sale of reserves | MMBoe [1] (7) (2) (54)  
Proved developed and undeveloped reserves, ending balance | MMBoe [1] 1,625 752 757  
Proved developed reserves | MMBoe [1] 1,285 574 589 600
Proved developed producing reserves | MMBoe [1] 1,260 564 578 582
Proved undeveloped reserves | MMBoe [1] 340 178 168 223
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 282 276 296  
Proved developed and undeveloped reserves, revisions due to prices 55 (26) (7)  
Proved developed and undeveloped reserves, revisions other than price (23) 18 (13)  
Proved developed and undeveloped reserves, extensions and discoveries 112 71 76  
Proved developed and undeveloped reserves, extensions and discoveries 393 1 3  
Proved developed and undeveloped reserves, production (106) (57) (55)  
Proved developed and undeveloped reserves, sale of reserves (4) (1) (24)  
Proved developed and undeveloped reserves, ending balance 709 282 276  
Proved developed reserves 544 194 198 196
Proved developed producing reserves 533 190 191 188
Proved undeveloped reserves 165 88 78 100
Natural Gas [Member]        
Reserve Quantities [Line Items]        
Proved developed and undeveloped reserves, beginning balance | Mcf 1,512 1,621 1,802  
Proved developed and undeveloped reserves, revisions due to prices | Mcf 382 (209) (86)  
Proved developed and undeveloped reserves, revisions other than price | Mcf 11 119 (50)  
Proved developed and undeveloped reserves, extensions and discoveries | Mcf 348 188 269  
Proved developed and undeveloped reserves, extensions and discoveries | Mcf 961 19 7  
Proved developed and undeveloped reserves, production | Mcf (325) (221) (219)  
Proved developed and undeveloped reserves, sale of reserves | Mcf (11) (5) (102)  
Proved developed and undeveloped reserves, ending balance | Mcf 2,878 1,512 1,621  
Proved developed reserves | Mcf 2,361 1,244 1,344 1,427
Proved developed producing reserves | Mcf 2,316 1,223 1,327 1,394
Proved undeveloped reserves | Mcf 517 268 277 375
Natural Gas Liquids [Member]        
Reserve Quantities [Line Items]        
Proved developed and undeveloped reserves, beginning balance 218 211 227  
Proved developed and undeveloped reserves, revisions due to prices 36 (17) (6)  
Proved developed and undeveloped reserves, revisions other than price 64 17 (9)  
Proved developed and undeveloped reserves, extensions and discoveries 58 33 39  
Proved developed and undeveloped reserves, extensions and discoveries 110 3 1  
Proved developed and undeveloped reserves, production (48) (28) (28)  
Proved developed and undeveloped reserves, sale of reserves (1) (1) (13)  
Proved developed and undeveloped reserves, ending balance 437 218 211  
Proved developed reserves 348 173 167 166
Proved developed producing reserves 341 171 165 162
Proved undeveloped reserves 89 45 44 61
[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.