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Additional Financial Information (Non-Cash Investing and Financing Activities) (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Non-cash investing activities
Issuance of common shares related to acquisitions and mergers	$ 1,284
Non-cash financing activities
Accrued dividends (see Note 12)	0	$ 13
Conversions of convertible senior subordinated notes	0	16
Starz
Non-cash investing activities
Issuance of common shares related to acquisitions and mergers	1,284	0
Accrued purchase consideration for dissenting shareholders	886	0
Issuance of Starz share-based payment replacement awards	187	0
Pilgrim Media Group
Non-cash investing activities
Issuance of common shares related to acquisitions and mergers	$ 0	$ 56

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