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Segment Information (Segment Information By Business Unit) (Details) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Sep. 30, 2016 segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable business segments | segment	3		2
Segment revenues	$ 752	$ 671		$ 1,945	$ 1,556
Gross contribution	150	67		251	205
Segment general and administration	41	26		111	78
Segment profit (loss)	109	41		140	127
Reportable Segments
Segment Reporting Information [Line Items]
Segment profit (loss)	109	41		140	127
Reportable Segments | Motion Pictures
Segment Reporting Information [Line Items]
Segment revenues	440	506		1,266	1,135
Gross contribution	77	51		153	157
Segment general and administration	26	18		74	60
Segment profit (loss)	51	33		79	97
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Segment revenues	229	165		595	421
Gross contribution	33	17		70	49
Segment general and administration	7	5		23	15
Segment profit (loss)	26	12		47	34
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Segment revenues	85	0		86	0
Gross contribution	41	(1)		29	(1)
Segment general and administration	8	3		14	3
Segment profit (loss)	33	(4)		15	(4)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment revenues	(2)	0		(2)	0
Gross contribution	(1)	0		(1)	0
Segment profit (loss)	$ (1)	$ 0		$ (1)	$ 0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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