Long-Term Debt and Other Credit Facilities - Narrative (Details) $ in Millions		1 Months Ended
	Apr. 30, 2024	Jun. 30, 2024 USD ($)	May 31, 2024	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Total principal				$ 2,660	$ 2,849
Bonds | PEDFA 2009B Bonds
Debt Disclosure [Abstract]
Interest rate		5.25%		5.25%
Debt Instrument [Line Items]
Total principal		$ 50		$ 50	50
Interest rate		5.25%		5.25%
Bonds | PEDFA 2009C Bonds
Debt Disclosure [Abstract]
Interest rate		5.25%		5.25%
Debt Instrument [Line Items]
Total principal		$ 81		$ 81	81
Interest rate		5.25%		5.25%
Letter of Credit
Debt Instrument [Line Items]
Letters of credit terminated		$ 133
Secured Debt | Secured ISDAs
Debt Instrument [Line Items]
Total principal				$ 18
Secured Debt | TLC
Debt Disclosure [Abstract]
Interest rate				8.60%
Debt Instrument [Line Items]
Total principal				$ 470	470
Interest rate				8.60%
Interest rate			1.00%
Reduction in interest rate			3.50%
Interest rate, floor	0.0050		0
Secured Debt | TLB
Debt Disclosure [Abstract]
Interest rate				8.60%
Debt Instrument [Line Items]
Total principal				$ 859	$ 866
Interest rate				8.60%
Interest rate			1.00%
Reduction in interest rate			3.50%
Interest rate, floor	0.0050		0