Long-term Incentive Compensation (Schedule of Liability-Classified Stock-Based Compensation Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive compensation – expensed	$ 7	$ 7	$ 11	$ 18
Long-term incentive compensation – capitalized	4	4	7	11
Liability-Classified Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive compensation – expensed	0	4	1	12
Long-term incentive compensation – capitalized	$ 1	$ 2	$ 1	$ 8