Consolidated Statements of Comprehensive Income (Loss) Statement - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Net income (loss)	$ (672)	$ (13)	$ (726)	$ (4)
Cumulative translation adjustment	(9)	18	(6)	19
Change in interest rate swaps, net of income taxes of $2 and $4 for the three months ended March 31, 2020 and 2019 and $11 for the six months ended March 31, 2019	(46)	(10)	(39)	(31)
Other comprehensive (loss) income	(55)	8	(45)	(12)
Total comprehensive loss	$ (727)	$ (5)	$ (771)	$ (16)