Long-Term Debt (Schedule Of Material Terms Of Fiber Term Notes) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Principal outstanding	$ 11,896,000,000	$ 11,569,000,000
Interest Rate	6.801%	6.996%
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%
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%
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%
Final Maturity Date	Aug. 20, 2053
Series 2024-1 Revenue Term Notes Class A-2 Due 5/20/2031 [Member]
Debt Instrument [Line Items]
Issue Date	Jul. 01, 2024
Principal outstanding	$ 530,000,000
Interest Rate	6.19%
Final Maturity Date	Jun. 20, 2054
Series 2024-1 Revenue Term Notes Class B Due 5/30/2031 [Member]
Debt Instrument [Line Items]
Issue Date	Jul. 01, 2024
Principal outstanding	$ 73,000,000
Interest Rate	7.02%
Final Maturity Date	Jun. 20, 2054
Series 2024-1 Revenue Term Notes Class C Due 5/20/2031 [Member]
Debt Instrument [Line Items]
Issue Date	Jul. 01, 2024
Principal outstanding	$ 147,000,000
Interest Rate	11.16%
Final Maturity Date	Jun. 20, 2054
Fiber Term Notes [Member]
Debt Instrument [Line Items]
Interest rate per annum	5.00%
Basis spread on variable rate, remaining term	10 years
Interest rate margin	5.00%