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Commitments, Contingencies and Guarantees (Narrative) (Details)		6 Months Ended
	Apr. 20, 2020 USD ($) $ / bbl	Jun. 30, 2020 USD ($)
Commitments, Contingencies And Guarantees [Abstract]
Aggregate loss on securities		$ 42,000,000
Maximum aggregate loss, if securities' price falls to zero and no debts collected		50,000,000
Guarantees, Fair Value Disclosure		$ 0
Oil and Gas, Average Sale Price | $ / bbl	(37.63)
Aggregate provisionary loss	$ 88,000,000
Recognized loss	$ 104,000,000

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Aggregate Provisionary Loss

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- Definition

Maximum Aggregate Loss, If Securities' Price Falls To Zero And No Debts Collected

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- Definition

Sales price per unit of oil and gas produced.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1204
-Paragraph (b)
-Subparagraph (1)

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Amount of decrease in the fair value of derivatives recognized in the income statement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 5
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Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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