Equity-Based Compensation (Summary of Equity-Based Compensation) (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-based compensation	[1]	$ 156	$ 103	$ 100
Intrinsic value of all settled equity-based awards		47	247	31
Tax benefit on settled equity-based awards		$ 6	$ 47	$ 9

[1] Prior to the Distribution in March 2019, equity-based compensation included allocated expense for both executive directors and corporate executives of 21CF, allocated using a proportional allocation driver, which management has deemed to be reasonable.