Long-Term Incentive Compensation (Schedule of Performance Cash Awards Stock-Based Compensation Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive compensation – expensed	$ 23	$ 30	$ 30
Long-term incentive compensation – capitalized	15	20	18
Performance cash awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term incentive compensation – expensed	9	6	4
Long-term incentive compensation – capitalized	$ 10	$ 6	$ 4