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Investments (Equity Method Investments Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended | 30 Months Ended | 75 Months Ended | 105 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Sep. 30, 2010 | Dec. 31, 2016 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in equity method investee |  |  | $ 13 | $ 4 |  |  |  |  |
EPIX |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in equity method investee |  |  |  |  |  |  | $ 80 | $ 0 |
Equity method investment distributions received | $ 14 | $ 0 | $ 14 | $ 0 |  |  |  |  | $ 42
Equity method investment, ownership percentage | 31.15% | 31.15% | 31.15% | 31.15% |  |  |  | 31.15% | 31.15%
Pop |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in equity method investee | $ 0 | $ 0 | $ 0 | $ 1 |  |  |  |  |
Ownership interest percentage after call option, partner in equity method investment | 80.00% |  | 80.00% |  |  |  |  | 80.00% | 80.00%
Call option, period exercisable beginning March 26, 2018 |  |  | 30 days |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  | 50.00% |  |  |  |  | 50.00% | 50.00%
Defy Media |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Effective economic interest in Defy Media | 10.30% |  | 10.30% |  |  |  |  | 10.30% | 10.30%
Roadside Attractions |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 43.00% |  | 43.00% |  |  |  |  | 43.00% | 43.00%
Pantelion Films |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 49.00% |  | 49.00% |  |  |  |  | 49.00% | 49.00%
Atom Tickets |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in equity method investee |  |  |  |  | $ 8 | $ 4 |  |  |
Equity method investment, ownership percentage | 19.00% |  | 19.00% |  |  |  |  | 19.00% | 19.00%
Playco |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 41.30% |  | 41.30% |  |  |  |  | 41.30% | 41.30%
Redeemable Preferred Stock | Pop |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Rate of dividend on preferred stock |  |  | 10.00% |  |  |  |  |  |
Total accretion period to redemption date of mandatorily redeemable preferred stock units and dividend |  |  | 10 years |  |  |  |  |  |

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