Long-Term Debt (Material Terms Of Fiber Term Notes) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Aug. 08, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Principal outstanding	$ 11,231,000,000		$ 8,963,000,000
Interest rate per annum	7.103%
Series 2023-1 Revenue Term Notes Class A-2 Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Issue Date	Aug. 08, 2023
Principal outstanding	$ 1,119,000,000
Interest Rate	6.60%	6.60%
Final Maturity Date	Aug. 20, 2053
Series 2023-1 Revenue Term Notes Class B Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Issue Date	Aug. 08, 2023
Principal outstanding	$ 155,000,000
Interest Rate	8.30%	8.30%
Final Maturity Date	Aug. 20, 2053
Series 2023-1 Revenue Term Notes Class C Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Issue Date	Aug. 08, 2023
Principal outstanding	$ 312,000,000
Interest Rate	11.50%	11.50%
Final Maturity Date	Aug. 20, 2053
Fiber Term Notes [Member]
Debt Instrument [Line Items]
Interest rate per annum	5.00%
Fiber Term Notes [Member] | US Treasury (UST) Interest Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate, remaining term	10 years
Interest rate margin	5.00%