Segment Information - Revenue and Long-Lived Assets by Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Total Revenues	$ 1,923	$ 2,266	$ 2,479	$ 2,340	$ 2,466	$ 2,457	$ 2,627	$ 2,524	$ 9,008	$ 10,074	$ 9,024
Total long-lived assets	4,356				3,484				4,356	3,484
U.S. and Canada [Member]
Segment Reporting Information [Line Items]
Total Revenues									3,763	4,044	3,998
Total long-lived assets	1,413				983				1,413	983
Europe [Member]
Segment Reporting Information [Line Items]
Total Revenues									1,502	1,664	1,766
Total long-lived assets	805				654				805	654
Australasia and Other [Member]
Segment Reporting Information [Line Items]
Total Revenues									3,743	4,366	$ 3,260
Total long-lived assets	$ 2,138				$ 1,847				$ 2,138	$ 1,847