Debt (Exchanges) (Details) - 4.00% Senior Guaranteed Exchangeable Bonds due December 2025 shares in Millions, $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
Jun. 30, 2025 USD ($) shares	Jun. 30, 2025 USD ($) shares	Jun. 30, 2025 USD ($) shares
Debt
Debt instrument interest rate stated percentage	4.00%	4.00%	4.00%
Aggregate principal amount of debt issued in exchanges \| $	$ 49	$ 50	$ 50
Loss on convertible debt \| $		$ 24	$ 24
Shares issued upon conversion (in shares) \| shares	18.6	18.6	18.6
Incremental portion pursuant to governing indenture
Debt
Shares issued upon conversion (in shares) \| shares		9.2	9.2

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details