Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions					3 Months Ended		9 Months Ended
	Apr. 09, 2018	Jan. 01, 2018	Nov. 15, 2017	Jul. 25, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments in and Advances to Affiliates [Line Items]
Revenue					$ 2,837	$ 2,693	$ 8,114	$ 7,887
Operating margin					671	640	1,927	1,820
Income (Loss) from Equity Method Investments					$ 6	$ 24	31	33
Minority Owned Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Revenue							734	532
Operating margin							119	91
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest							36	44
Simple Energy [Member]
Investments in and Advances to Affiliates [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 35
sPower [Member]
Investments in and Advances to Affiliates [Line Items]
Equity Method Investment, Ownership Percentage			2.00%	48.00%
Payments to Acquire Businesses, Net of Cash Acquired			$ 19	$ 461
Fluence [Member]
Investments in and Advances to Affiliates [Line Items]
Payments to Acquire Interest in Joint Venture		$ 7
Business Acquisition, Percentage of Voting Interests Acquired		50.00%
Business Combination, Consideration Transferred		$ 50
Non-cash [Member] \| Fluence [Member]
Investments in and Advances to Affiliates [Line Items]
Contribution of Property		$ 20					$ 20	$ 0