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Supplemental Information on Oil and Gas Operations (Unaudited) (Proved Undeveloped Reserves) (Details)
 12 Months Ended
Dec. 31, 2020
MMBoe
Reserve Quantities [Line Items]  
Proved undeveloped reserves (MMBoe) beginning balance 168 [1]
Proved undeveloped reserves, extensions and discoveries 105
Proved undeveloped reserves, conversion to proved developed reserves (68)
Proved undeveloped reserves (MMBoe) ending balance 178 [1]
United States [Member]  
Reserve Quantities [Line Items]  
Proved undeveloped reserves (MMBoe) beginning balance 168
Proved undeveloped reserves, extensions and discoveries 105
Proved undeveloped reserves, revisions due to prices (8)
Proved undeveloped reserves, revisions other than price (20)
Proved undeveloped reserves, Purchase of reserves 2
Proved undeveloped reserves, sale of reserves (1)
Proved undeveloped reserves, conversion to proved developed reserves (68)
Proved undeveloped reserves (MMBoe) ending balance 178
[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.