Segment Information (Reconciliation from Income Before Income Tax (Expense) Benefit to Total Segment EBITDA) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information Profit Loss [Abstract]
Income before income tax (expense) benefit	$ 706	$ 654	$ 1,568	$ 1,577
Amortization of cable distribution investments	10	11	29	43
Depreciation and amortization	58	43	152	126
Impairment and restructuring charges	14	14	14	11
Interest expense	81	7	112	20
Interest income	(19)	0	(19)	0
Other, net	(84)	(23)	116	75
Total Segment EBITDA	$ 766	$ 706	$ 1,972	$ 1,852