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Segment Information (Acquisition of Investment in Films and Television Programs by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	$ 213	$ 236	$ 660	$ 771
Reportable Segments | Motion Pictures
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	76	140	267	504
Reportable Segments | Television Production
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	106	96	345	267
Reportable Segments | Media Networks
Segment Reporting Information [Line Items]
Acquisition of investment in films and television programs and program rights	$ 31	$ 0	$ 48	$ 0

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Acquisition of investment in films and television programs and program rights.

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