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Incentive Plans - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 21	$ 25	$ 99	$ 61
Due to affiliates	168		168		$ 102
Unrecognized stock-based compensation expense	105		$ 105
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	15	$ 32	37
Restricted Stock Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	3	4	12	7
Unrecognized stock-based compensation expense	25		25
Restricted Stock Liability Awards \| Affiliates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Due to affiliates	4		4		$ 7
Performance unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	6	6	20	15
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1	$ 0	2	2
Parsley \| Restricted stock and performance units - Parsley awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 0		$ 33	$ 0