Long-Term Debt and Note Payable - Affiliate - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Long-term debt
Long-term debt, gross	$ 2,203
Unamortized premiums, net	6	$ 5
Unamortized debt issuance costs	(53)	(62)
Total long-term debt	2,156	3,334
Less current maturities	0	(948)
Long-term debt, excluding current maturities	2,156	2,386
Note payable - affiliate	1,187	1,130
Senior notes
Long-term debt
Long-term debt, gross	$ 1,986	3,170
Senior notes \| Minimum
Long-term debt
Stated interest rate	6.50%
Senior notes \| Maximum
Long-term debt
Stated interest rate	7.75%
Term loan
Long-term debt
Long-term debt, gross	$ 215	$ 215
Interest rate on term loan	2.11%	2.15%
Term loan \| London Interbank Offered Rate (LIBOR)
Long-term debt
Basis spread on variable rate	2.00%
Term loan \| Minimum \| London Interbank Offered Rate (LIBOR)
Long-term debt
Basis spread on variable rate	1.50%
Term loan \| Maximum \| London Interbank Offered Rate (LIBOR)
Long-term debt
Basis spread on variable rate	2.50%
Finance leases
Long-term debt
Long-term debt, gross	$ 2	$ 6
Note payable - affiliate \| Affiliated entity
Long-term debt
Weighted average interest rate, revolving promissory note	4.80%
Note payable - affiliate	$ 1,187	$ 1,130

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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