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Acquisitions (Unaudited Pro Forma Information) (Details) - CTF Transaction [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Revenue $ 10,255 $ 11,157
Operating income 1,433 1,529
Net loss attributable to Frontier common shareholders $ (262) $ (192)
Basic and diluted net income per share attributable to Frontier common shareholders $ (3.38) $ (2.66)