Acquisition - Purchase Price Allocation (Details) - TransPower - USD ($) $ in Millions		6 Months Ended	9 Months Ended
	Jan. 16, 2020	Jun. 30, 2020	Jun. 30, 2020
Business Acquisition [Line Items]
Purchase price	$ 15		$ 15
Investments in TransPower	12		12
Assets acquired and liabilities assumed:
Cash	2	$ 2	2
Receivables, net	5	5	5
Inventories, net	8	8	8
PP&E	10	9	9
Accounts payable	(3)	(3)	(3)
Other current liabilities	(17)	(18)	(18)
Total identifiable net assets acquired	5	3	3
Goodwill and other intangible assets resulting from the acquisition of TransPower	22	24	24
Identifiable net assets and goodwill acquired	$ 27	27	$ 27
Measurement Period Adjustments
Purchase price		0
Investments in TransPower		0
Cash		0
Receivables, net		0
Inventories, net		0
PP&E		(1)
Accounts payable		0
Other current liabilities		(1)
Total identifiable net assets acquired		(2)
Goodwill and other intangible assets resulting from the acquisition of TransPower		2
Total assets acquired, goodwill, and liabilities assumed		$ 0