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Investments (Available-for-sale Narrative) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 08, 2016 | Mar. 27, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cost basis |  |  |  |  |  |  | $ 159
Gain recognized on Starz available-for-sale securities |  |  | $ 20 | $ 0 | $ 20 | $ 0 |
Starz |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Issuance of common shares related to investments, shares |  | 4,967,695 |  |  |  |  |
Starz Series A Common Stock | Starz |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Shares received in exchange (in shares) |  | 2,118,038 |  |  |  |  |
Starz Series B Common Stock | Starz |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Shares received in exchange (in shares) |  | 2,590,597 |  |  |  |  |
Starz |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Fair value | $ 179 |  |  |  |  |  |
Cost basis | $ 159 |  |  |  |  |  |
Gain recognized on Starz available-for-sale securities |  |  | $ 20 |  | $ 20 |  |

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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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