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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.

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