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Supplemental Information on Oil and Gas Operations (Unaudited) (Proved Undeveloped Reserves) (Details)
 12 Months Ended
Dec. 31, 2021
MMBoe
Reserve Quantities [Line Items]  
Proved undeveloped reserves (MMBoe) beginning balance 178 [1]
Proved undeveloped reserves, extensions and discoveries 160
Proved undeveloped reserves (MMBoe) ending balance 340 [1]
United States [Member]  
Reserve Quantities [Line Items]  
Proved undeveloped reserves (MMBoe) beginning balance 178
Proved undeveloped reserves, extensions and discoveries 160
Proved undeveloped reserves, revisions due to prices 8
Proved undeveloped reserves, revisions other than price 11
Proved undeveloped reserves, Purchase of reserves 90
Proved undeveloped reserves, conversion to proved developed reserves (107)
Proved undeveloped reserves (MMBoe) ending balance 340
[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.