Debt Instruments - Senior Secured Notes (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Less: unamortized debt issuance costs	$ (50)	$ (60)
Plus: unamortized premium	29	37
Senior Notes
Debt Instrument [Line Items]
Payment-in-kind interest expense	35	185
Less: unamortized debt issuance costs	(43)	(53)
Plus: unamortized premium	29	37
Outstanding principal, net of debt issuance costs	4,395	4,362
Notes due December 1, 2028 (the "2028 Senior Secured Notes") | Senior Notes
Debt Instrument [Line Items]
Total principal amount	$ 732	981
Year 1 PIK Interest Rate	12.00%
Debt instrument, interest rate, cash rate year two	9.00%
Thereafter Cash Interest Rate	9.00%
Notes due June 1, 2030 (the "2030 Senior Secured Notes") | Senior Notes
Debt Instrument [Line Items]
Total principal amount	$ 1,660	1,471
Year 1 PIK Interest Rate	13.00%
Debt instrument, interest rate, cash rate year two	11.00%
Thereafter Cash Interest Rate	9.00%
Notes due June 1, 2031 (the "2031 Senior Secured Notes") | Senior Notes
Debt Instrument [Line Items]
Total principal amount	$ 1,982	1,741
Year 1 PIK Interest Rate	14.00%
Debt instrument, interest rate, cash rate year two	0.00%
Thereafter Cash Interest Rate	9.00%
Senior Secured Notes | Senior Notes
Debt Instrument [Line Items]
Total principal amount	$ 4,409	$ 4,378