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Mergers and Acquisitions (Narrative) (Details) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 08, 2016 USD ($) plaintiff $ / shares shares | Nov. 12, 2015 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2016 USD ($) shares | Mar. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Petitions filed | plaintiff | 3 |  |  |  |  |
Accrued merger consideration payable |  |  | $ 886 | $ 886 | $ 886 | $ 0
Goodwill |  |  | 2,734 | 2,734 | 2,734 | 535
Principal amount of debt outstanding |  |  | 3,520 | 3,520 | 3,520 | 786
Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration | $ 1,130 |  |  |  |  |
Goodwill | $ 2,199 |  |  |  |  |
Revenue since acquisition |  |  | 97 |  |  |
Income before income taxes since acquisition |  |  | $ 40 |  |  |
Starz | Acquisition-related Costs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Merger-related transaction costs |  |  |  | $ 49 | $ 61 |
Starz | Starz Series A Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash to be paid per outstanding share (in usd per share) | $ / shares | $ 18.00 |  |  |  |  |
Cash consideration | $ 1,077 |  |  |  |  |
Starz | Starz Series B Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash to be paid per outstanding share (in usd per share) | $ / shares | $ 7.26 |  |  |  |  |
Cash consideration | $ 53 |  |  |  |  |
Starz | Class A Voting Shares |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Lionsgate share price (in usd per share) | $ / shares | $ 26.48 |  |  |  |  |
Starz | Class A Voting Shares | Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Conversion of Stock, Shares Issued | shares | 0.5 |  |  |  |  |
Starz | Class A Voting Shares | Starz Series B Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Conversion of stock, shares converted | shares | 0.6321 |  |  |  |  |
Starz | Class B Non-Voting Shares |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Lionsgate share price (in usd per share) | $ / shares | $ 25.70 |  |  |  |  |
Starz | Class B Non-Voting Shares | Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Conversion of Stock, Shares Issued | shares | 0.5 |  |  |  |  |
Starz | Class B Non-Voting Shares | Starz Series A Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Conversion of stock, shares converted | shares | 0.6784 |  |  |  |  |
Starz | Class B Non-Voting Shares | Starz Series B Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Conversion of stock, shares converted | shares | 0.6321 |  |  |  |  |
Starz | Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Lionsgate share price (in usd per share) | $ / shares | $ 26.09 |  |  |  |  |
Pilgrim Media Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price, common shares issued or issuable (in shares) | shares |  | 1,517,451 |  |  |  |
Cash consideration |  | $ 145 |  |  |  |
Percentage of interest acquired |  | 62.50% |  |  |  |
Aggregate purchase price |  | $ 202 |  |  |  |
Purchase price, common shares issued, value assigned |  | 57 |  |  |  |
Pilgrim Media Group | Transactional Costs |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition related and transactional costs |  | $ 8 |  |  |  | 3
Customer relationships | Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Weighted-average useful life | 17 years |  |  |  |  |
Starz Dissenting Shareholders | Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price, common shares issued or issuable (in shares) | shares | 17,000,000 |  |  |  |  |
Outstanding equity interests (in shares) | shares |  |  | 25,000,000 | 25,000,000 | 25,000,000 |
Accrued merger consideration payable | $ 886 |  | $ 886 | $ 886 | $ 886 |
Period for demanding appraisal rights |  |  |  |  | 60 days |
Shareholders withdrawing demands of appraisal rights (in shares) | shares |  |  | 2,510,485 | 2,510,485 | 2,510,485 |
Revolving Credit Facility |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Principal amount of debt outstanding |  |  | $ 0 | $ 0 | $ 0 | $ 161
Outstanding obligations | 241 |  |  |  |  |
Revolving Credit Facility | Starz |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Outstanding obligations | 255 |  |  |  |  |
Starz Senior Notes | Senior Notes |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Principal amount of debt outstanding | $ 675 |  |  |  |  |

X
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