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Income Taxes (Details) - USD ($) $ in Millions		1 Months Ended			3 Months Ended		9 Months Ended
	Jul. 19, 2024	Jun. 30, 2025	Apr. 30, 2025	Mar. 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Tax Examination [Line Items]
Effective income tax rate					50.00%	3.40%	48.30%	10.50%
Federal statutory income tax rate					21.00%	21.00%	21.00%	21.00%
Tax (benefit) expense related to finalization of tax returns/ previously taxed earnings					$ (16)			$ 7
Tax expense due to change in statutory rate					5
Tax expense due to the disposition of an equity interest in a joint venture					5
Tax (benefit) expense for other items						$ 3	$ (2)	3
Tax benefit associated with impairment charges						44
Tax benefit due to tax examinations								64
Interest expense associated with interest on uncertain tax liabilities								8
Increase in income tax expense		$ 3			$ 21	$ (7)	$ 28	$ (19)
Increase in noncurrent income taxes receivable		10	$ 31
Increase in deferred tax liabilities		$ 13		$ 31
Increase in income taxes payable				$ 31
Transfer Pricing, Additional Taxes
Income Tax Examination [Line Items]
Income tax examination, estimate of possible loss	$ 80
Transfer Pricing, Penalties
Income Tax Examination [Line Items]
Income tax examination, estimate of possible loss	$ 34

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