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Financial Instruments Narrative (Details) bbl in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($) bbl	Dec. 31, 2018 USD ($) bbl
Investment Segment
Derivative [Line Items]
Fair value derivative instruments with credit risk related contingent features in a liability position | $	$ 56	$ 0
Not designated as hedging instrument | Commodity contracts not considered probable of settlement [Member] | Energy Segment
Derivative [Line Items]
Volume of derivatives (barrels) | bbl	4	2

X

- Definition

Fair value of credit risk derivative liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5708775-113959

+ Details

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- Definition

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+ References

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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