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Long-Term Debt Long Term Debt (Schedule of Equity Units) (Parenthetical) (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Aug. 31, 2016 | Aug. 15, 2016
Capital Unit [Line Items] |  |  |  |  |
Stock Purchase Contract Liability |  | $ 111,000,000 | $ 212,000,000 |  |
Total payments |  | $ 101,000,000 | $ 94,000,000 |  |
Capital Unit, Class A |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Stock Purchase Contract Liability | [1],[2] |  |  |  | $ 190,600,000
Total Long-term Debt |  |  |  | $ 1,400,000,000 |
Capital Unit, Class A | Remarketable Subordinated Notes, 2016 Series A-1, due August 15, 2021 |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Total Long-term Debt |  |  |  |  | 700,000,000
Capital Unit, Class A | Remarketable Subordinated Notes, 2016 Series A-2, due August 15, 2024 |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Total Long-term Debt |  |  |  |  | $ 700,000,000
[1] | 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.
[2] | 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.

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