Long-Term Incentive Compensation (Schedule of Equity-Classified Stock Option Stock-Based Compensation Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Long-term incentive compensation – expensed	$ 30	$ 17	$ 17
Equity-classified awards - capitalized	18	7	10
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Long-term incentive compensation – expensed	0	0	1
Equity-classified awards - capitalized	$ 0	$ 0	$ 0