Segment Information (Reconciliation from Income Before Income Tax (Expense) Benefit to Total Segment OIBDA) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information Profit Loss [Abstract]
Income before income tax (expense) benefit	$ 31	$ 312	$ 862	$ 923
Amortization of cable distribution investments	9	20	19	32
Depreciation and amortization	51	42	94	83
Interest expense	15	6	31	13
Other, net	339	93	200	95
Total Segment OIBDA	$ 445	$ 473	$ 1,206	$ 1,146