Equity-Based Compensation (Summary of Equity-Based Compensation) (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity-based compensation	[1]	$ 103	$ 100	$ 57
Intrinsic value of all settled equity-based awards		247	31	38
Tax benefit on vested equity-based awards		$ 47	$ 9	$ 14

[1] Prior to the Distribution, 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.