Significant Financing Transactions (Schedule of Equity Units) (Details) - Series A RSNs - USD ($)					1 Months Ended
		Aug. 15, 2016	Jul. 01, 2016	Apr. 01, 2016	Jul. 31, 2016	Apr. 30, 2016
Capital Unit [Line Items]
Units Issued	[1]	28,000,000
Total Net Proceeds	[1]	$ 1,374,800,000
Stock Purchase Contract Annual Rate	[1]	4.75%
Stock Purchase Contract Liability	[1]	$ 190,600,000
Remarketable Subordinated Notes
Capital Unit [Line Items]
Units Issued			8,500,000.0	8,500,000.0	8,500,000.0	8,500,000.0
Total Long-term Debt	[1]	$ 1,400,000,000.0
RSN Annual Interest Rate	[1],[2]	2.00%
Remarketable Subordinated Notes, 2016 Series A-1, due 2021
Capital Unit [Line Items]
Total Long-term Debt		$ 700,000,000
Remarketable Subordinated Notes, 2016 Series A-2, due 2024
Capital Unit [Line Items]
Total Long-term Debt		$ 700,000,000

[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] Annual interest rate applies to each of the Series A-1 RSNs and Series A-2 RSNs.