Commitments And Contingencies (Narrative) (Details) $ in Millions		1 Months Ended	12 Months Ended
	Jan. 30, 2020 USD ($) state item	May 23, 2023 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2023
RDOF Program, Phase I [Member]
Commitments And Contingencies [Line Items]
Awarded amount	$ 371
Period to build gigabit capable broadband	10 years
Number of location to build gigabit capable broadband | item	127,000
Number of states to build gigabit capable broadband | state	8
RDOF Program, Phase II [Member]
Commitments And Contingencies [Line Items]
Annual support offered by the Federal Communications Commission			$ 313
Citynet [Member]
Commitments And Contingencies [Line Items]
Litigation payment		$ 18
Minimum [Member]
Commitments And Contingencies [Line Items]
Terms of lease arrangements				1 year
Maximum [Member]
Commitments And Contingencies [Line Items]
Terms of lease arrangements				99 years