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Subsequent Events (Details) - USD ($) shares in Millions	Nov. 01, 2021	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Subsequent Event [Line Items]
Outstanding borrowings		$ 1,259,000,000	$ 9,095,000,000
Senior Notes
Subsequent Event [Line Items]
Debt repurchased, principal				$ 95,000,000
Subsequent Event | 6.75% Senior Notes | Senior Notes
Subsequent Event [Line Items]
Interest rate, stated percentage	6.75%
Debt assumed	$ 950,000,000
Subsequent Event | Vine Energy Corporation (Vine)
Subsequent Event [Line Items]
Consideration transferred	$ 1,300,000,000
Common stock issued in acquisition (in shares)	19.0
Cash	$ 92,000,000
Debt repurchased, principal	163,000,000
Premium paid with cash	13,000,000
Subsequent Event | Vine Energy Corporation (Vine) | New RBL
Subsequent Event [Line Items]
Outstanding borrowings	$ 0

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