Commitments And Contingencies (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Regulatory Commitments [Abstract]
Number of States in our Territory	29
CAF Phase II [ Member]
Regulatory Commitments [Abstract]
Annual support offered by the Federal Communications Commission	$ 332
Number of households to be serviced under regulatory funded programs	774,000
Northwest Operations [Member]
Regulatory Commitments [Abstract]
Annual support offered by the Federal Communications Commission	$ 19