Goodwill and Other Intangible Assets: Intangible Asset Amortization Methodology and Useful Lives (Details)	3 Months Ended
	Mar. 31, 2015
Franchise rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Method	straight-line
Finite-Lived Intangible Asset, Useful Life	30 years
Customer lists
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Method	sum-of-years-digits
Customer lists | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	9 years
Customer lists | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Cable franchise rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Method	straight-line
Finite-Lived Intangible Asset, Useful Life	15 years
Other (a)
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Method	straight-line
Other (a) | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Other (a) | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years