Stockholders' Equity (Narrative) (Details)			1 Months Ended				12 Months Ended
	Nov. 11, 2019 $ / shares	Nov. 06, 2019	Sep. 30, 2020 $ / shares shares	Aug. 31, 2020 USD ($) shares $ / shares	Jan. 31, 2020 $ / shares shares	Nov. 30, 2019 USD ($) shares	Jun. 30, 2021 USD ($) Class Vote Holder $ / shares shares	Jun. 30, 2020 $ / shares shares	Jun. 30, 2019 USD ($)	Mar. 19, 2019 $ / shares
Stockholders Equity [Line Items]
Common stock, number of classes | Class							2
Unrealized Holding Gains on Securities | Accounting Standards Update 2016-01 | Cumulative Effect Period Of Adoption Adjustment
Stockholders Equity [Line Items]
Gain on Securitization of Financial Assets									$ 130,000,000
Class B Common Stock
Stockholders Equity [Line Items]
Number of votes | Vote							1
Number of holders of shares | Holder							4,700
Series common stock, shares authorized | shares							1,000,000,000	1,000,000,000
Series common stock, par value | $ / shares							$ 0.01	$ 0.01		$ 0.01
Stock repurchase program, authorized amount							$ 2,000,000,000
Additional share repurchases agreement amount							$ 2,000,000,000
Accelerated Share Repurchases Agreement Amount				$ 66,000,000
Accelerated share repurchases, amount of payment to third party financial institution				$ 66,000,000
Stock repurchase program, number of shares repurchased during the period | shares			400,000	2,000,000.0
Accelerated share repurchases, percentage of shares expected to be repurchased				80.00%
Accelerated share repurchases, initial price paid per share | $ / shares				$ 26.01
Accelerated share repurchases, final price paid per share | $ / shares			$ 27.67
Share repurchase program, amount intended to promptly repurchase						$ 150,000,000
Class B Common Stock | Maximum | Stockholders Agreement | Murdoch Family Trust
Stockholders Equity [Line Items]
Outstanding voting power, percentage		44.00%
Percentage of voting power increase in any rolling twelve-month period		1.75%
Class A Common Stock
Stockholders Equity [Line Items]
Number of holders of shares | Holder							17,700
Series common stock, shares authorized | shares							2,000,000,000	2,000,000,000
Series common stock, par value | $ / shares							$ 0.01	$ 0.01		$ 0.01
Accelerated Share Repurchases Agreement Amount				$ 154,000,000
Accelerated share repurchases, amount of payment to third party financial institution				$ 154,000,000		$ 350,000,000
Stock repurchase program, number of shares repurchased during the period | shares			900,000	4,700,000	2,000,000	8,000,000
Accelerated share repurchases, percentage of shares expected to be repurchased				80.00%		80.00%
Accelerated share repurchases, initial price paid per share | $ / shares	$ 34.99			$ 26.00
Accelerated share repurchases, final price paid per share | $ / shares			$ 27.57		$ 36.05
Series Common Stock
Stockholders Equity [Line Items]
Series common stock, shares authorized | shares							35,000,000
Series common stock, par value | $ / shares							$ 0.01
Preferred Class A
Stockholders Equity [Line Items]
Preferred stock, shares authorized | shares							35,000,000
Preferred stock, par value | $ / shares							$ 0.01
Class A and Class B Common Stock
Stockholders Equity [Line Items]
Stock repurchase program, authorized amount							$ 2,000,000,000
Additional share repurchases agreement amount							2,000,000,000
Stock repurchase remaining authorized repurchase amount							$ 2,400,000
Number of accelerated share repurchase | shares | shares				2
Stock repurchase program, number of shares repurchased during the period | shares							32,000,000	17,000,000