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Incentive Plans (Schedule of Stock-based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 25	$ 21	$ 61	$ 95
Due to affiliates	137		137		$ 190
Unrecognized stock-based compensation expense	98		$ 98
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	15	14	$ 37	65
Restricted Stock Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	4	2	7	14
Unrecognized stock-based compensation expense	17		17
Restricted Stock Liability Awards \| Affiliates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Due to affiliates	5		5		$ 11
Performance unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	6	5	15	15
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0	$ 0	$ 2	$ 1