Long-Term Debt (Schedule Of Secured And Unsecured Debt) (Details) - USD ($)	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%
Debentures Due 11/15/2031 [Member]
Debt Instrument [Line Items]
Principal outstanding		$ 47,000,000
Series 2023-1 Revenue Term Notes Class A-2 Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 1,119,000,000
Interest rate	6.60%
Series 2023-1 Revenue Term Notes Class B Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 155,000,000
Interest rate	8.30%
Series 2023-1 Revenue Term Notes Class C Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 312,000,000
Interest rate	11.50%
Series 2024-1 Revenue Term Notes Class A-2 Due 5/20/2031 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 530,000,000
Interest rate	6.19%
Series 2024-1 Revenue Term Notes Class B Due 5/30/2031 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 73,000,000
Interest rate	7.02%
Series 2024-1 Revenue Term Notes Class C Due 5/20/2031 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 147,000,000
Interest rate	11.16%
Secured Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 8,433,000,000	8,436,000,000
Secured Debt [Member] | Term loan due 7/1/2031 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 1,020,000,000	$ 1,023,000,000
Interest rate	6.792%	8.763%
Secured Debt [Member] | First Lien Notes Due 10/15/2027 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 1,150,000,000	$ 1,150,000,000
Interest rate	5.875%	5.875%
Secured Debt [Member] | First Lien Notes Due 5/1/2028 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 1,550,000,000	$ 1,550,000,000
Interest rate	5.00%	5.00%
Secured Debt [Member] | First Lien Notes Due 5/15/2030 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 1,200,000,000	$ 1,200,000,000
Interest rate	8.75%	8.75%
Secured Debt [Member] | First Lien Notes Due 3/15/2031 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 750,000,000	$ 750,000,000
Interest rate	8.625%	8.625%
Secured Debt [Member] | Second Lien Notes Due 5/1/2029 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 1,000,000,000	$ 1,000,000,000
Interest rate	6.75%	6.75%
Secured Debt [Member] | Second Lien Notes Due 11/1/2029 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 750,000,000	$ 750,000,000
Interest rate	5.875%	5.875%
Secured Debt [Member] | Second Lien Notes Due 1/15/2030 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 1,000,000,000	$ 1,000,000,000
Interest rate	6.00%	6.00%
Secured Debt [Member] | IDRB Due 5/1/2030 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 13,000,000	$ 13,000,000
Interest rate	6.20%	6.20%
Secured Subsidiary Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 2,713,000,000	$ 2,383,000,000
Secured Subsidiary Debt [Member] | Debentures Due 11/15/2031 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 47,000,000	$ 47,000,000
Interest rate	8.50%	8.50%
Secured Subsidiary Debt [Member] | Series 2023-1 Revenue Term Notes Class A-2 Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 1,119,000,000	$ 1,119,000,000
Interest rate	6.60%	6.60%
Secured Subsidiary Debt [Member] | Series 2023-1 Revenue Term Notes Class B Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 155,000,000	$ 155,000,000
Interest rate	8.30%	8.30%
Secured Subsidiary Debt [Member] | Series 2023-1 Revenue Term Notes Class C Due 7/20/2028 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 312,000,000	$ 312,000,000
Interest rate	11.50%	11.50%
Secured Subsidiary Debt [Member] | Series 2024-1 Revenue Term Notes Class A-2 Due 5/20/2031 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 530,000,000	$ 530,000,000
Interest rate	6.19%	6.19%
Secured Subsidiary Debt [Member] | Series 2024-1 Revenue Term Notes Class B Due 5/30/2031 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 73,000,000	$ 73,000,000
Interest rate	7.02%	7.02%
Secured Subsidiary Debt [Member] | Series 2024-1 Revenue Term Notes Class C Due 5/20/2031 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 147,000,000	$ 147,000,000
Interest rate	11.16%	11.16%
Secured Subsidiary Debt [Member] | DDTL Facility due 12/31/2029 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 330,000,000
Interest rate	6.069%
Unsecured Subsidiary Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 750,000,000	$ 750,000,000
Unsecured Subsidiary Debt [Member] | Debentures Due 5/15/2027 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 200,000,000	$ 200,000,000
Interest rate	6.75%	6.75%
Unsecured Subsidiary Debt [Member] | Debentures Due 2/1/2028 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 300,000,000	$ 300,000,000
Interest rate	6.86%	6.86%
Unsecured Subsidiary Debt [Member] | Debentures Due 2/15/2028 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 200,000,000	$ 200,000,000
Interest rate	6.73%	6.73%
Unsecured Subsidiary Debt [Member] | Debentures Due 10/15/2029 [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 50,000,000	$ 50,000,000
Interest rate	8.40%	8.40%