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Stock-Based Compensation - Compensation Expense (Details) - Executives - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
SGI awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liabilities associated with SGI awards	$ 52		$ 52		$ 92
SGI awards | General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	4	$ 1	11	$ 11
Performance-based awards for other executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liabilities associated with SGI awards	26		26		$ 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	$ 10	$ (3)	$ 17	$ 12

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