Pending Acquisition of tw telecom (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement	Jun. 15, 2014
Business Combination, Consideration Transferred		$ 7,600,000,000
Business Acquisition, Debt Assumed			1,900,000,000
business acquisition, cash consideration per share		10
Stock consideration per share		0.7
2.4 Billion Senior Secured Debt [Member]
Business Acquisition [Line Items]
Proceeds from Issuance of Secured Debt		2,400,000,000
$600 Million Unsecured Debt [Member]
Business Acquisition [Line Items]
Proceeds from Issuance of Unsecured Debt		600,000,000
$3.0 Billion Unsecured Debt [Member]
Business Acquisition [Line Items]
Proceeds from Issuance of Debt		$ 3,000,000,000