Long-term Incentive Compensation (Schedule of 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 Payment Arrangement, Noncash Expense [Abstract]
Long-term incentive compensation – expensed	$ 7	$ 7	$ 11	$ 18
Long-term incentive compensation – capitalized	$ 4	$ 4	$ 7	$ 11