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Share-Based Compensation - Schedule of Share-based Compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	$ 4	$ 17	$ 16
Unrecognized Expense	40
Incentive Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	3	12	4
Unrecognized Expense	$ 26
Weighted-Average Remaining Years	2 years 10 months 24 days
Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	$ 1	5	8
Unrecognized Expense	$ 7
Weighted-Average Remaining Years	2 years 9 months 18 days
Performance awards | CEO Performance Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	$ 0	0	2
Unrecognized Expense	$ 7
Weighted-Average Remaining Years	1 year
Performance awards | 2018 CEO Performance Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	$ 0	0	2
Unrecognized Expense	$ 0
Weighted-Average Remaining Years	0 years
Performance awards | Former CEO Performance Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expenses	$ 0	$ 0	$ 0
Unrecognized Expense	$ 0
Weighted-Average Remaining Years	0 years

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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