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Debt - Long-Term Debt, Net of Unamortized Discount and Debt Issuance Costs (Details) R in Billions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2022 ZAR (R) | Apr. 04, 2022 USD ($) | Oct. 01, 2021 USD ($) | Oct. 01, 2021 ZAR (R) | Mar. 15, 2021 USD ($) | May 01, 2020 USD ($)
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Long-term debt, gross | $ 2,529,000,000 |  |  |  |  |  |  |
Finance leases | 47,000,000 | $ 14,000,000 |  |  |  |  |  |
Total borrowings | 2,521,000,000 | 2,612,000,000 |  |  |  |  |  |
Less: Long-term debt due within one year | (24,000,000) | (18,000,000) |  |  |  |  |  |
Debt issuance costs | (33,000,000) | (36,000,000) |  |  |  |  |  |
Long-term debt, net | 2,464,000,000 | 2,558,000,000 |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Original Principal | 1,300,000,000 |  |  |  |  |  |  |
Long-term debt, gross | $ 898,000,000 | $ 897,000,000 |  |  |  |  |  |
Average effective interest rate | 4.80% | 5.10% |  |  |  |  |  |
2022 Term Loan Facility |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Original Principal | $ 400,000,000 |  |  | $ 400,000,000 |  |  |  |
Long-term debt, gross | $ 393,000,000 | $ 0 |  |  |  |  |  |
Average effective interest rate | 5.80% |  |  |  |  |  |  |
Senior Notes due 2029 |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Original Principal | $ 1,075,000,000 |  |  |  |  |  | $ 1,075,000,000 |
Annual Interest Rate | 4.63% |  | 4.63% |  |  |  | 4.625% |
Long-term debt, gross | $ 1,075,000,000 | 1,075,000,000 |  |  |  |  |  |
Standard Bank Term Loan Facility |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Original Principal | 98,000,000 |  |  |  |  |  |  |
Long-term debt, gross | $ 77,000,000 | $ 92,000,000 | R 1.3 |  | $ 98,000,000 | R 1.5 |  |
Average effective interest rate | 7.20% | 7.30% |  |  |  |  |  |
Australian Government Loan |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Long-term debt, gross | $ 1,000,000 | $ 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 | $ 30,000,000 | $ 33,000,000 |  |  |  |  |  |
Average effective interest rate | 4.40% | 3.10% |  |  |  |  |  |
Senior Notes | 6.5% Senior Secured Notes due 2025 |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |
Original Principal | $ 500,000,000 |  |  |  |  |  |  | $ 500,000,000
Annual Interest Rate | 6.50% |  | 6.50% |  |  |  |  | 6.50%
Long-term debt, gross | $ 0 | $ 500,000,000 |  |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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