Events Associated with the Merger of tw telecom (Details) - USD ($)	3 Months Ended		9 Months Ended		16 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Oct. 31, 2014
Business Acquisition [Line Items]
Cash, Cash Equivalents and Restricted Cash						$ 309,000,000
Total Revenue		$ 2,038,000,000		$ 6,071,000,000
Net Income		$ 81,000,000		$ 229,000,000
Net Income per Share, Basic		$ 0.24		$ 0.69
Net Income per Share, Diluted		$ 0.24		$ 0.68
Business Acquisition, Effective Date of Acquisition	Oct. 31, 2014
business acquisition, cash consideration per share	$ 10
Purchase price allocation adjustment			$ 60,000,000
Long-term Debt						(2,099,000,000)
Stock consideration per share	0.7
Business Combination, Integration Related Costs					$ 109,000,000
Property, Plant, and Equipment						1,554,000,000
Goodwill						5,178,000,000
Identifiable Intangible Assets						1,263,000,000
Other Assets						142,000,000
total Assets						8,446,000,000
Deferred Revenue						(57,000,000)
Other Liabilities						(279,000,000)
Total Liabilities						(2,435,000,000)
Total Consideration to be Allocated						$ 6,011,000,000