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Stock-Based Compensation - Compensation Expense (Details) - Executives - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
SGI awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liabilities associated with SGI awards	$ 48		$ 48		$ 92
SGI awards | General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	14	$ 10	24	$ 20
Performance-based awards for other executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liabilities associated with SGI awards	25		25		$ 15
Performance-based awards for other executives | General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 5	$ 2	$ 17	$ 14

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

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