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Leases - Undiscounted Cash Flows (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Operating Leases    
Operating lease liability to be paid, year one $ 8 $ 11
Operating lease liability to be paid, year two 4 8
Operating lease liability to be paid, year three 2 3
Operating lease liability to be paid, year four 0 1
Operating lease liability to be paid, year five 0 0
Thereafter 0 0
Total minimum lease payments 14 23
Less: amount of lease payments representing interest (2) (5)
Present value of future minimum lease payments 12 18
Less: current obligations under leases (6) (8)
Long-term lease obligations 6 10
Finance Lease, Liability, Payment, Due [Abstract]    
Finance lease liability to be paid, year one 72 72
Finance lease liability to be paid, year two 50 39
Finance lease liability to be paid, year three 16 17
Finance lease liability to be paid, year four 0 0
Finance lease liability to be paid, year five 0 0
Thereafter 0 0
Total minimum lease payments 138 128
Less: amount of lease payments representing interest (9) (7)
Present value of future minimum lease payments 129 121
Less: current obligations under leases (66) (67)
Long-term lease obligations $ 63 $ 54