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Leases - Undiscounted Cash Flows (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Operating Leases    
Operating lease liability to be paid, year one $ 7 $ 8
Operating lease liability to be paid, year two 3 4
Operating lease liability to be paid, year three 1 2
Operating lease liability to be paid, year four 1 0
Operating lease liability to be paid, year five 2 0
Thereafter 0 0
Total minimum lease payments 14 14
Less: amount of lease payments representing interest (5) (2)
Present value of future minimum lease payments 9 12
Less: current obligations under leases (4) (6)
Long-term lease obligations 5 6
Finance Lease, Liability, Payment, Due [Abstract]    
Finance lease liability to be paid, year one 61 72
Finance lease liability to be paid, year two 27 50
Finance lease liability to be paid, year three 5 16
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 93 138
Less: amount of lease payments representing interest (6) (9)
Present value of future minimum lease payments 87 129
Less: current obligations under leases (57) (66)
Long-term lease obligations $ 30 $ 63