Commitments And Contingencies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Regulatory Commitments [Abstract]
Number of households to be serviced under regulatory funded programs	774,000
Number of States in our Territory	29
CAF II [ Member]
Regulatory Commitments [Abstract]
Annual support offered by the Federal Communications Commission	$ 332
CTF Transaction [Member] | CAF II [ Member]
Regulatory Commitments [Abstract]
Annual support offered by the Federal Communications Commission	$ 49