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Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended		12 Months Ended
	Apr. 18, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jun. 22, 2020	Mar. 31, 2019
Investments in and Advances to Affiliates [Line Items]
Revenue		$ 2,217		$ 2,483	$ 4,555	$ 5,133
Operating margin		524		502	1,031	1,088
Gain (Loss) on Disposition of Business		(27)		(3)	(27)	(7)
Income (Loss) from Equity Method Investments		8		$ 5	6	(1)
Minority Owned Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Revenue					939	481
Operating margin					153	55
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest					11	(30)
Majority Owned Affiliate [Member]
Investments in and Advances to Affiliates [Line Items]
Revenue					1	43
Operating margin					(1)	(1)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest					(2)	(6)
OPGC [Member]
Investments in and Advances to Affiliates [Line Items]
Equity Method Investments, Fair Value Disclosure			$ 152				$ 212
Equity Method Investment OTTI		$ 158	$ 43		201		$ 92
Equity Method Investment, Ownership Percentage Sold								49.00%
sPower [Member]
Investments in and Advances to Affiliates [Line Items]
Equity Method Investment, Ownership Percentage Sold	48.00%
Proceeds from Sale of Equity Method Investments	$ 173
Reinvestment of Proceeds from Sale of Equity Method Investments	58				$ 0	$ 58
Gain (Loss) on Disposition of Business	$ 28
Equity Method Investment, Ownership Percentage	26.00%								50.00%

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