Discontinued operations - Financial information Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Revenues:
Total revenues	$ 75		$ 96
Costs and expenses:
Selling, general and administrative	13		18
Depreciation and amortization	4		3
Impairment losses	12	$ 12	0
Operating income (loss)	(9)		10
Interest expense, net	1
Other (income) expense, net	(36)		1
Loss before taxes	26		9
Income tax expense (benefit)	(4)		(2)
Income from discontinued operations, net of tax	30		11
Product
Revenues:
Total revenues	39		53
Costs and expenses:
Costs, excluding depreciation and amortization	34		41
Service
Revenues:
Total revenues	36		43
Costs and expenses:
Costs, excluding depreciation and amortization	$ 21		$ 24