Commitments And Contingencies (Narrative) (Details) $ in Millions			12 Months Ended
	May 23, 2023 USD ($)	Jan. 30, 2020 USD ($) state item	Dec. 31, 2023 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2022 USD ($)
Commitments And Contingencies [Line Items]
ACP, amount per month provided to qualified customers | item			30
ACP, amount per month provided to qualified customers on Tribal lands | item			75
Accounts payable and accrued liabilities			$ 1,103		$ 1,410
Accounts payable			857		$ 1,200
Vendor financing liabilities included in other current liabilities			263
Capital expenditures associated with vendor financing			255
Vendor financing payments			5
Capital expenditure associated with vendor financing payments			4
Operating expenses related to vendor financing payments			$ 1
Settlement agreement amount	$ 18
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
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