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Stock-Based Compensation - Compensation Expense (Details) - Executives - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
SGI awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense, net of adjustments	$ (1)	$ 10	$ 8	$ 22
Liabilities associated with SGI awards, net of adjustments	27		27		$ 51
Performance-based awards for non-Section 16 executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense, net of adjustments	2	$ (3)	4	$ 7
Liabilities associated with SGI awards, net of adjustments	$ 21		$ 21		$ 30

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Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Share-Based Liabilities Paid, Net of Adjustments

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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