Long-Term Debt (Equity Units and RSNs) (Details) - USD ($) shares in Millions		1 Months Ended	12 Months Ended
	Oct. 05, 2016	Oct. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Total Net Proceeds	$ 654,000,000		$ 654,000,000	$ 0	$ 0
Total Long-Term Debt			2,680,000,000
Equity units subject to mandatory redemption
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Units Issued	13.5
Stock Purchase Contract Annual Rate	5.00%	5.00%
October series D 1.50% senior notes maturing 2019 | Other long-term debt
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Total Long-Term Debt		$ 400,000,000
RSN Annual Interest Rate		1.50%
October series C 1.5% RSNs maturing 2024 | Other long-term debt
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Total Long-Term Debt	$ 675,000,000	$ 675,000,000	$ 675,000,000
RSN Annual Interest Rate	1.50%	1.50%