Long-Term Debt Long Term Debt (Schedule of Equity Units) (Details) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended				0 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Jul. 01, 2014		Jun. 07, 2013
Capital Unit [Line Items]
Stock Purchase Contract Liability	$ 216,000,000	[1]	$ 139,000,000	[1]
Total payments	66,000,000		17,000,000
Capital Unit, Class A
Capital Unit [Line Items]
Units Issued					20		11
Total Net Proceeds					982,000,000		533,500,000
Stock Purchase Contract Annual Rate					4.875%		5.055%
Stock Purchase Contract Liability					142,800,000	[1]	76,700,000	[1]
Capital Unit, Class A | Remarketable Subordinated Notes
Capital Unit [Line Items]
Total Long-term Debt					1,000,000,000		550,000,000
RSN Annual Interest Rate					1.50%		1.07%
Capital Unit, Class B
Capital Unit [Line Items]
Units Issued							11
Total Net Proceeds							553,500,000
Stock Purchase Contract Annual Rate							4.82%
Stock Purchase Contract Liability							79,300,000	[1]
Capital Unit, Class B | Remarketable Subordinated Notes
Capital Unit [Line Items]
Total Long-term Debt							$ 550,000,000
RSN Annual Interest Rate							1.18%

[1] Payments of $66 million and $17 million were made in 2014 and 2013, respectively. The stock purchase contract liability was $216 million and $139 million at December 31, 2014 and 2013, respectively.