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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 01, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2016
Subsequent Event [Line Items]          
Common Stock, Dividends, Per Share, Cash Paid [1]   $ 0.885 $ 0.885 $ 0.885  
Business Combination, Consideration Transferred         $ 461
Common Stock [Member]          
Subsequent Event [Line Items]          
Dividends Payable, Date Declared [1]   Aug. 02, 2016 May 20, 2016 Feb. 18, 2016  
Dividends Payable, Date to be Paid [1]   Sep. 30, 2016 Jun. 30, 2016 Mar. 31, 2016  
Dividends Payable, Date of Record [1]   Sep. 16, 2016 Jun. 17, 2016 Mar. 18, 2016  
Conversion of Preferred Stock [Member]          
Subsequent Event [Line Items]          
Preferred Stock, Shares Outstanding         9,775,000
Stock Issued During Period, Shares, New Issues   11,612,700     11,612,700
Common Stock, Conversion Basis         1.188
Conversion of Stock, Description         each
FiberNet [Member] | Subsequent Event [Member]          
Subsequent Event [Line Items]          
Business Combination, Consideration Transferred $ 1,500        
Dividend Declared [Member] | Common Stock [Member]          
Subsequent Event [Line Items]          
Dividends Payable, Date Declared   Oct. 18, 2016      
Dividends Payable, Date to be Paid   Dec. 30, 2016      
Dividends Payable, Date of Record   Dec. 16, 2016      
Paid subsequent to current quarter end [Member]          
Subsequent Event [Line Items]          
Common Stock, Dividends, Per Share, Cash Paid   $ 0.950      
[1] Inclusive of dividends accrued for holders of unvested restricted stock units and payments of previously accrued dividends for holders of restricted stock units that have vested during the nine months ended September 30, 2016.