Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
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-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Acquisitions (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Acquisitions (Details) - USD ($) $ in Millions	Jul. 31, 2019	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 53
Guaimbe Solar Complex [Member]
Business Acquisition [Line Items]
Project Financing Disbursed			$ 119
Asset Acquisition, Consideration Transferred			152
Asset acquisition, additional cash paid			$ 33
Los Cururos [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 138