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Stock-Based Compensation - Compensation Expense (Details) - Executives - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
SGI awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liabilities associated with SGI awards	$ 43		$ 43		$ 58
SGI awards | General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	7	$ 4	12	$ 11
Performance-based awards for non-Section 16 officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liabilities associated with SGI awards	28		28		$ 29
Performance-based awards for non-Section 16 officers | General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 2	$ 10	$ 10	$ 17

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

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