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Debt - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 07, 2024
Debt Instrument [Line Items]
Outstanding debt	$ 5,118	$ 5,065
Debt issuance costs	52	56
Unamortized discount	$ 95	100
Senior Secured Notes \| 9.25% senior secured notes due 2025
Debt Instrument [Line Items]
Debt instrument interest rate percentage	9.25%		9.25%
Senior Secured Notes \| 4.00% senior exchangeable notes due 2025
Debt Instrument [Line Items]
Debt instrument interest rate percentage	4.00%
Senior Secured Notes \| 7.375% senior secured notes due 2025
Debt Instrument [Line Items]
Debt instrument interest rate percentage	7.375%		7.375%
Term Loan \| 2021 Term Loan B-1, 2021 Term Loan B-2, 2022 Term Loan B-1, 2024 Term Loan B-1 And 2024 Term Loan B-2
Debt Instrument [Line Items]
Debt instrument weighted average interest rate	4.94%
Letter of Credit
Debt Instrument [Line Items]
Cash collateral for borrowed securities	$ 21	21
Letter of Credit \| Line of Credit
Debt Instrument [Line Items]
Outstanding letters of credit	$ 12	$ 13