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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.