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Incentive Plans (Schedule of Stock-based Compensation Expense) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 16,000,000	$ 29,000,000
Due to affiliates	100,000,000		$ 190,000,000
Unrecognized stock-based compensation expense	$ 97,000,000
Remaining vesting period awards (less than)	3 years
Restricted stock - Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 11,000,000	18,000,000
Restricted Stock Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0	5,000,000
Unrecognized stock-based compensation expense	10,000,000
Restricted Stock Liability Awards \| Affiliates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Due to affiliates	2,000,000		$ 11,000,000
Performance unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	4,000,000	5,000,000
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,000,000	$ 1,000,000