Supplemental Guarantor Information (Supplemental Condensed Consolidating Statements of Operations) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Condensed Income Statements Captions [Line Items]
Revenues		$ 8,037	$ 7,682	$ 15,039	$ 14,188
Expenses		(6,769)	(5,878)	(12,161)	(10,880)
Equity (losses) earnings of affiliates		(33)	(41)	27	(6)
Interest expense, net		(312)	(299)	(625)	(599)
Interest income		9	9	19	18
Earnings from subsidiary entities		0	0	0	0
Other, net		(229)	(88)	(301)	(99)
Income from continuing operations before income tax benefit (expense)		703	1,385	1,998	2,622
Income tax benefit (expense)		1,218	(448)	827	(791)
Income from continuing operations		1,921	937	2,825	1,831
(Loss) income from discontinued operations, net of tax		(5)	(1)	11	(7)
Net income		1,916	936	2,836	1,824
Less: Net income attributable to noncontrolling interests	[1]	(85)	(80)	(150)	(147)
Net income attributable to Twenty-First Century Fox, Inc. stockholders		1,831	856	2,686	1,677
Comprehensive income attributable to Twenty-First Century Fox stockholders		2,058	659	3,055	1,439
Legal Entities | 21st Century Fox America, Inc.
Condensed Income Statements Captions [Line Items]
Revenues		0	0	0	0
Expenses		(100)	(96)	(176)	(238)
Equity (losses) earnings of affiliates		0	0	0	(1)
Interest expense, net		(436)	(411)	(866)	(823)
Interest income		0	1	0	2
Earnings from subsidiary entities		3,193	1,860	4,784	3,475
Other, net		(206)	(65)	(219)	(86)
Income from continuing operations before income tax benefit (expense)		2,451	1,289	3,523	2,329
Income tax benefit (expense)		1,783	(414)	1,459	(702)
Income from continuing operations		4,234	875	4,982	1,627
(Loss) income from discontinued operations, net of tax		0	0	0	0
Net income		4,234	875	4,982	1,627
Less: Net income attributable to noncontrolling interests		0	0	0	0
Net income attributable to Twenty-First Century Fox, Inc. stockholders		4,234	875	4,982	1,627
Comprehensive income attributable to Twenty-First Century Fox stockholders		4,278	576	5,000	1,244
Legal Entities | Twenty-First Century Fox
Condensed Income Statements Captions [Line Items]
Revenues		0	0	0	0
Expenses		0	0	0	0
Equity (losses) earnings of affiliates		0	0	0	0
Interest expense, net		(205)	(189)	(410)	(377)
Interest income		5	1	10	1
Earnings from subsidiary entities		2,036	1,045	3,075	2,060
Other, net		0	0	0	0
Income from continuing operations before income tax benefit (expense)		1,836	857	2,675	1,684
Income tax benefit (expense)		0	0	0	0
Income from continuing operations		1,836	857	2,675	1,684
(Loss) income from discontinued operations, net of tax		(5)	(1)	11	(7)
Net income		1,831	856	2,686	1,677
Less: Net income attributable to noncontrolling interests		0	0	0	0
Net income attributable to Twenty-First Century Fox, Inc. stockholders		1,831	856	2,686	1,677
Comprehensive income attributable to Twenty-First Century Fox stockholders		2,058	659	3,055	1,439
Legal Entities | Non-Guarantor
Condensed Income Statements Captions [Line Items]
Revenues		8,037	7,682	15,039	14,188
Expenses		(6,669)	(5,782)	(11,985)	(10,642)
Equity (losses) earnings of affiliates		(33)	(41)	27	(5)
Interest expense, net		(20)	(20)	(42)	(39)
Interest income		353	328	702	655
Earnings from subsidiary entities		0	0	0	0
Other, net		(23)	(23)	(82)	(13)
Income from continuing operations before income tax benefit (expense)		1,645	2,144	3,659	4,144
Income tax benefit (expense)		2,123	(696)	1,515	(1,250)
Income from continuing operations		3,768	1,448	5,174	2,894
(Loss) income from discontinued operations, net of tax		0	0	0	0
Net income		3,768	1,448	5,174	2,894
Less: Net income attributable to noncontrolling interests		(85)	(80)	(150)	(147)
Net income attributable to Twenty-First Century Fox, Inc. stockholders		3,683	1,368	5,024	2,747
Comprehensive income attributable to Twenty-First Century Fox stockholders		3,743	1,073	5,161	2,433
Reclassifications and Eliminations
Condensed Income Statements Captions [Line Items]
Revenues		0	0	0	0
Expenses		0	0	0	0
Equity (losses) earnings of affiliates		0	0	0	0
Interest expense, net		349	321	693	640
Interest income		(349)	(321)	(693)	(640)
Earnings from subsidiary entities		(5,229)	(2,905)	(7,859)	(5,535)
Other, net		0	0	0	0
Income from continuing operations before income tax benefit (expense)		(5,229)	(2,905)	(7,859)	(5,535)
Income tax benefit (expense)		(2,688)	662	(2,147)	1,161
Income from continuing operations		(7,917)	(2,243)	(10,006)	(4,374)
(Loss) income from discontinued operations, net of tax		0	0	0	0
Net income		(7,917)	(2,243)	(10,006)	(4,374)
Less: Net income attributable to noncontrolling interests		0	0	0	0
Net income attributable to Twenty-First Century Fox, Inc. stockholders		(7,917)	(2,243)	(10,006)	(4,374)
Comprehensive income attributable to Twenty-First Century Fox stockholders		$ (8,021)	$ (1,649)	$ (10,161)	$ (3,677)

[1] Net income attributable to noncontrolling interests includes $48 million and $43 million for the three months ended December 31, 2017 and 2016, respectively, and $77 million and $70 million for the six months ended December 31, 2017 and 2016, respectively, relating to redeemable noncontrolling interests.