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Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions					3 Months Ended		6 Months Ended
	Apr. 09, 2018	Jan. 01, 2018	Nov. 15, 2017	Jul. 25, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments in and Advances to Affiliates [Line Items]
Revenue					$ 2,537	$ 2,613	$ 5,277	$ 5,194
Operating margin					600	623	1,256	1,180
Income (Loss) from Equity Method Investments					$ 14	$ 2	25	9
Minority Owned Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Revenue							485	341
Operating margin							78	65
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest							31	23
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%
Fair Value of Assets Acquired		$ 50
Non-cash [Member] | Fluence [Member]
Investments in and Advances to Affiliates [Line Items]
Contribution of Property		$ 20					$ 20	$ 0

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

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