Commitments And Contingencies (Narrative) (Details) $ in Millions				6 Months Ended
	Jul. 27, 2022 USD ($)	Oct. 04, 2021 USD ($)	Dec. 07, 2020 USD ($) item	Jun. 30, 2022 USD ($) state
Commitments And Contingencies [Line Items]
Short-term purchase commitment, period				2 years
Short-term purchase commitment, extension period				2 years
FTC And California [Member]
Commitments And Contingencies [Line Items]
Litigation payment		$ 9
NOV [Member]
Commitments And Contingencies [Line Items]
Prescribed fine	$ 5
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 | item			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