Equity (Schedule of Changes in Equity) (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2018		Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity
Balance, beginning of period		$ 11,054		$ 6,533	$ 9,594		$ 6,093
Net income		14		869	618		1,259
Other comprehensive income		2		98	3		180
Other		(22)		(19)	168		(37)
Net (decrease) increase in 21CF investment		(642)		472	23		458
Balance, end of period		10,406		7,953	10,406		7,953
Total FOX equity
Increase (Decrease) in Stockholders' Equity
Balance, beginning of period		11,045		6,533	9,594		6,093
Net income		8		869	612		1,259
Other comprehensive income		2		98	3		180
Other		(19)		(19)	162	[1]	(37)
Net (decrease) increase in 21CF investment		(642)	[2]	472	23	[2]	458
Balance, end of period		10,394		7,953	10,394		7,953
Noncontrolling interests
Increase (Decrease) in Stockholders' Equity
Balance, beginning of period	[3]	9		0	0		0
Net income	[3]	6		0	6		0
Other comprehensive income	[3]	0		0	0		0
Other	[3]	(3)		0	6		0
Net (decrease) increase in 21CF investment	[3]	0		0	0		0
Balance, end of period	[3]	$ 12		$ 0	$ 12		$ 0

[1] Approximately $200 million was reclassified to 21CF investment from Redeemable noncontrolling interests (See Note 4 - Fair Value).

[2] Includes accumulated other comprehensive loss of $143 million transferred from 21CF investment (See Note 10 - Pension and Other Postretirement Benefits).

[3] Excludes Redeemable noncontrolling interests which are reflected in temporary equity (See Note 4 - Fair Value under the heading “Redeemable Noncontrolling Interests”).