Fair Value Measurements (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Asset Impairment Charges	$ 22,000,000	$ 195,000,000	$ 217,000,000	$ 369,000,000
Fair Value, Nonrecurring [Member]
Assets, Fair Value Disclosure	0		0	0
Liabilities, Fair Value Disclosure	$ 0		0	0
Renewable Energy [Member]
Decrease in liability				20,000,000
Gain (loss) recognized			(21,000,000)	21,000,000
HSG [Member]
Asset Impairment Charges			$ 0	$ 916,000,000

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

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Fair value of financial and nonfinancial obligations.

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