Fair Value Measurements (Narrative) (Details) - USD ($)	9 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Assets, Fair Value Disclosure	$ 0	$ 0
Liabilities, Fair Value Disclosure	0	$ 0
Significant Unobservable Inputs (Level 3) [Member]
Decrease in liability	20,000,000
Renewable Energy [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Unrealized gains	$ 21,000,000

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(b),(c)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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- Definition

Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

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- Definition

Fair value of financial and nonfinancial obligations.

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