Related Party Transactions and Twenty-First Century Fox, Inc. Investment (Components of the Net (Decrease) Increase in Twenty-First Century Fox, Inc. Investment) (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Dec. 31, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Net (decrease) increase in Twenty-First Century Fox, Inc. investment		$ (642)	$ 23
Twenty-First Century Fox, Inc. Investment
Related Party Transaction [Line Items]
Cash pooling, general financing activities and other	[1]	(594)	(14)
Corporate allocations		95	180
Net (decrease) increase in Twenty-First Century Fox, Inc. investment		$ (499)	$ 166

[1] The nature of activities included in the line item ‘Cash pooling, general financing activities and other’ includes financing activities, capital transfers, cash sweeps, other treasury services and Direct Corporate Expenses.