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Debt - Schedule of Long-Term Debt, Net of Unamortized Discount and Debt Issuance Costs (Details) R in Billions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Sep. 26, 2025 USD ($) | Sep. 30, 2024 USD ($) | Aug. 16, 2024 USD ($) | Aug. 16, 2024 ZAR (R) | May 01, 2024 USD ($) | Mar. 15, 2021 USD ($)
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Finance leases | $ 39,000,000 | $ 42,000,000 |  |  |  |  |  |
Total borrowings | 3,204,000,000 | 2,826,000,000 |  |  |  |  |  |
Less: Long-term debt due within one year | (39,000,000) | (35,000,000) |  |  |  |  |  |
Debt issuance costs | (33,000,000) | (32,000,000) |  |  |  |  |  |
Long-term debt, net | 3,132,000,000 | 2,759,000,000 |  |  |  |  |  |
2024 Term Loan Facility |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Original Principal | 741,000,000 |  |  |  |  |  | $ 741,000,000 |
Long-term debt, gross | $ 731,000,000 | $ 735,000,000 |  |  |  |  |  |
Average effective interest rate | 6.50% | 7.70% |  |  |  |  |  |
2024-B Term Loan Facility |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Original Principal | $ 902,000,000 |  |  | $ 902,000,000 |  |  |  |
Long-term debt, gross | $ 887,000,000 | $ 896,000,000 |  |  |  |  |  |
Average effective interest rate | 6.50% | 6.10% |  |  |  |  |  |
Senior Notes due 2029 |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Original Principal | $ 1,075,000,000 |  | $ 250,000,000 |  |  |  |  | $ 1,075,000,000
Annual Interest Rate | 4.63% |  | 4.625% |  |  |  |  | 4.625%
Long-term debt, gross | $ 1,075,000,000 | $ 1,075,000,000 |  |  |  |  |  |
Senior Secured Notes due 2030 |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Original Principal | $ 400,000,000 |  |  |  |  |  |  |
Annual Interest Rate | 9.13% |  |  |  |  |  |  |
Long-term debt, gross | $ 400,000,000 | 0 |  |  |  |  |  |
RMB Term Loan Facility |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Original Principal | 64,000,000 |  |  |  | $ 66,000,000 | R 1.1 |  |
Long-term debt, gross | $ 57,000,000 | $ 58,000,000 |  |  |  |  |  |
Average effective interest rate | 9.80% | 10.40% |  |  |  |  |  |
Australian Government Loan |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Long-term debt, gross | $ 2,000,000 | $ 1,000,000 |  |  |  |  |  |
MGT Loan |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Original Principal | 36,000,000 |  |  |  |  |  |  |
Long-term debt, gross | $ 13,000,000 | $ 19,000,000 |  |  |  |  |  |
Average effective interest rate | 6.10% | 6.10% |  |  |  |  |  |

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