Stock-Based Compensation - Compensation Expense (Details) - Executives - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
SGI awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liabilities associated with SGI awards, net of adjustments	$ 43		$ 43		$ 58
SGI awards | General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense, net of adjustments	10	$ 14	22	$ 24
Performance-based awards for non-Section 16 officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Liabilities associated with SGI awards, net of adjustments	22		22		$ 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, net of adjustments	$ (3)	$ 5	$ 7	$ 17