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Mergers and Acquisitions (Components of Estimated Purchase Consideration) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 08, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Cost basis |  |  |  |  |  | $ 159
Gain recognized on Starz available-for-sale securities |  | $ 20 | $ 0 | $ 20 | $ 0 |
Dissenting shareholders' liability |  | 886 |  | 886 |  | $ 0
Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cost basis | $ 159 |  |  |  |  |
Gain recognized on Starz available-for-sale securities |  | 20 |  | 20 |  |
Market value, as of December 8, 2016, of Starz Series A and Series B common stock already owned by Lionsgate | 179 |  |  |  |  |
Cash consideration paid to Starz stockholders | 1,130 |  |  |  |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | 1,284 |  |  |  |  |
Replacement of Starz share-based payment awards | 187 |  |  |  |  |
Total preliminary estimated purchase consideration | 3,666 |  |  |  |  |
Replacement of Starz share-based payment awards, unvested | 43 |  |  |  |  |
Starz Series A Common Stock | Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration paid to Starz stockholders | 1,077 |  |  |  |  |
Starz Series A Common Stock | Starz | Class B Non-Voting Shares |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | 1,044 |  |  |  |  |
Starz Series B Common Stock | Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration paid to Starz stockholders | 53 |  |  |  |  |
Starz Series B Common Stock | Starz | Class B Non-Voting Shares |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | 118 |  |  |  |  |
Starz Series B Common Stock | Starz | Class A Voting Shares |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of Lionsgate voting and non-voting shares issued to Starz's stockholders | 122 |  |  |  |  |
Starz Dissenting Shareholders | Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Dissenting shareholders' liability | $ 886 | $ 886 |  | $ 886 |  |

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