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Debt (Exchanges) (Details) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2025 USD ($) shares	Sep. 30, 2025 USD ($) shares
Debt
Loss on convertible debt		$ 99
4.00% Senior Guaranteed Exchangeable Bonds due December 2025
Debt
Debt instrument interest rate stated percentage	4.00%	4.00%
Aggregate principal amount of debt issued in exchanges	$ 147	$ 196
Shares issued upon conversion (in shares) | shares	54.7	73.3
Loss on convertible debt	$ 75	$ 99
4.00% Senior Guaranteed Exchangeable Bonds due December 2025 | Maximum
Debt
Aggregate principal amount of debt issued in exchanges		$ 196
4.00% Senior Guaranteed Exchangeable Bonds due December 2025 | Incremental portion pursuant to governing indenture
Debt
Shares issued upon conversion (in shares) | shares		35.9

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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