Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Investments in and Advances to Affiliates [Line Items]
Revenue	$ 2,635	$ 2,338
Operating margin (loss)	664	507
Gain (Loss) on Disposition of Business	$ (5)	0
Equity Method Investment, Ownership Percentage	10.00%
Income (Loss) from Equity Method Investments	$ (30)	(2)
Business Acquisition, Percentage of Voting Interests Acquired	75.00%
Minority Owned Affiliates [Member]
Investments in and Advances to Affiliates [Line Items]
Revenue	$ 506	370
Operating margin (loss)	32	55
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	(17)	(11)
OPGC [Member]
Investments in and Advances to Affiliates [Line Items]
Equity Method Investments, Fair Value Disclosure		152
Equity Method Investment OTTI		43
sPower [Member]
Investments in and Advances to Affiliates [Line Items]
Business Combination, Consideration Transferred	$ 77
Guacolda [Member]
Investments in and Advances to Affiliates [Line Items]
Equity Method Investment, Purchase Price Agreement		$ 34
Equity Method Investment, Ownership Percentage	50.00%
Equity Method Investment Long Lived Asset Impairment			$ 127
Unrecognized Equity Method Loss	$ 95