Supplemental Oil And Gas Information (Schedule Of Net Proved Oil And Gas Reserves And The Changes In Net Proved Oil And Gas Reserves) (FY) (Details)	12 Months Ended
Dec. 31, 2019 MBoe MBbls MMcf	Dec. 31, 2018 MBoe MBbls MMcf	Dec. 31, 2017 MBoe MBbls MMcf
Reserve Quantities [Line Items]
Proved reserves	1,094	870
Revisions of previous estimates	(203)	223
Improved recovery
Purchase of reserves in place		13
Extensions and discoveries	8	86
Production	(94)	(98)
Sales of reserves in place	(2)
Proved reserves	803	1,094
Proved developed reserves (equivalent) \| MBoe	803	976	832
Proved undeveloped reserves (equivalent) \| MBoe		118	38
Oil [Member]
Reserve Quantities [Line Items]
Proved reserves	1,094	870
Revisions of previous estimates	(203)	223
Improved recovery
Purchase of reserves in place		13
Extensions and discoveries	8	86
Production	(94)	(98)
Sales of reserves in place	(2)
Proved reserves	803	1,094
Proved developed reserves (volume)	803	976	832
Proved undeveloped reserves (volume)		118	38
Gas [Member]
Reserve Quantities [Line Items]
Proved reserves \| MMcf
Revisions of previous estimates \| MMcf
Improved recovery \| MMcf
Purchase of reserves in place \| MMcf
Extensions and discoveries \| MMcf
Production \| MMcf
Sales of reserves in place \| MMcf
Proved reserves \| MMcf
Proved developed reserves (volume) \| MMcf
Proved undeveloped reserves (volume) \| MMcf

Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Changes in proved reserve estimates resulting from application of improved recovery techniques.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

+ References

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Production of proved reserves.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Purchase of minerals in place.

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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Sales of minerals in place.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
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Energy measure of proved undeveloped reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Form 20-F
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-Subsection Instruction 2

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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