Commitments And Contingencies (Narrative) (Details) $ in Millions			3 Months Ended
	Oct. 04, 2021 USD ($)	Dec. 07, 2020 USD ($) state item	Mar. 31, 2022 USD ($) state
Commitments And Contingencies [Line Items]
Annual support offered by the Federal Communications Commission			$ 11,200
FTC And California [Member]
Commitments And Contingencies [Line Items]
Litigation payment	$ 9
CAF Phase II [Member]
Commitments And Contingencies [Line Items]
Number of states of operation | state			25
Annual support offered by the Federal Communications Commission			$ 313
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
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