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Long-Term Debt Long Term Debt (Schedule of Equity Units) (Detail) - USD ($) shares in Millions |  | 1 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 15, 2016 | Jul. 31, 2017 | Jul. 31, 2016 | Apr. 30, 2016 | Dec. 31, 2017 | May 31, 2017 | Dec. 31, 2016 | Aug. 31, 2016 | Mar. 31, 2016 | Jul. 31, 2014
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock Purchase Contract Liability |  |  |  |  |  |  | $ 111,000,000 |  | $ 212,000,000 |  |  |
Capital Unit, Class A |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Units Issued |  | 28.0 | [1] | 12.5 |  |  |  |  |  |  |  |
Total Net Proceeds | [1] | $ 1,374,800,000 |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  |  |  |  |  |  |  |  | $ 1,400,000,000 |  |
Stock Purchase Contract Annual Rate (Percentage) | [1] | 4.75% |  |  |  |  |  |  |  |  |  |
Stock Purchase Contract Liability | [1],[2] | $ 190,600,000 |  |  |  |  |  |  |  |  |  |
Stock Purchase Settlement Date | [1] | Aug. 15, 2019 |  |  |  |  |  |  |  |  |  |
Capital Unit, Class A | Remarketable Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Units Issued |  |  |  | 12.5 | 8.5 | 8.5 |  |  |  |  |  |
Total Long-term Debt |  | $ 1,400,000,000 | [1] |  |  |  |  | $ 1,000,000,000 |  |  | $ 550,000,000 | $ 1,000,000,000
RSN Annual Interest Rate |  | 2.00% | [1],[3] |  |  |  |  | 1.50% |  |  | 1.07% |
[1] | The maturity dates of the $700 million Series A-1 RSNs and $700 million Series A-2 RSNs are August 15, 2021 and August 15, 2024, respectively.
[2] | Payments of $101 million and $94 million were made in 2017 and 2016, respectively, including payments for the remarketed 2013 Series A and B notes and the remarketed 2014 Series A notes. The stock purchase contract liability was $111 million and $212 million at December 31, 2017 and 2016, respectively.
[3] | Annual interest rate applies to each of the Series A-1 RSNs and Series A-2 RSNs.

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