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Debt - Long-Term Debt, Net of Unamortized Discount and Debt Issuance Costs (Details) ¥ in Millions, R in Millions | 1 Months Ended | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) | Apr. 30, 2021 ZAR (R) | Mar. 31, 2021 USD ($) prepayment | Mar. 31, 2021 ZAR (R) prepayment | Mar. 31, 2021 CNY (¥) prepayment | Mar. 31, 2020 | Apr. 01, 2021 USD ($) | Mar. 15, 2021 USD ($) | Mar. 11, 2021 USD ($) | Dec. 31, 2020 USD ($) | May 01, 2020
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Finance leases |  |  | $ 14,000,000 |  |  |  |  |  |  | $ 15,000,000 |
Long-term debt |  |  | 3,465,000,000 |  |  |  |  |  |  | 3,356,000,000 |
Less: Long-term debt due within one year |  |  | (514,000,000) |  |  |  |  |  |  | (58,000,000) |
Debt issuance costs |  |  | (50,000,000) |  |  |  |  |  |  | (35,000,000) |
Long-term debt, net |  |  | $ 2,901,000,000 |  |  |  |  |  |  | 3,263,000,000 |
Number of voluntary prepayments | prepayment |  |  | 2 | 2 | 2 |  |  |  |  |  |
Prior Term Loan Facility, net of unamortized discount |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original Principal |  |  | $ 2,150,000,000 |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 0 |  |  |  |  |  |  | 1,607,000,000 |
Average effective interest rate |  |  | 4.50% | 4.50% | 4.50% | 5.00% |  |  |  |  |
New Term Loan Facility, net of unamortized discount |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original Principal |  |  | $ 1,300,000,000 |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 1,291,000,000 |  |  |  |  |  | $ 1,300,000,000 | 0 |
Average effective interest rate |  |  | 4.30% | 4.30% | 4.30% |  |  |  |  |  |
Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original Principal |  |  | $ 450,000,000 |  |  |  |  |  |  |  |
Annual Interest Rate |  |  | 5.75% |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 450,000,000 |  |  |  |  |  |  | 450,000,000 |
Senior Notes due 2025 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original Principal |  |  |  |  |  |  | $ 450,000,000 |  |  |  |
Senior Notes due 2026 |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original Principal |  |  | $ 615,000,000 |  |  |  |  |  |  |  |
Annual Interest Rate |  |  | 6.50% |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 0 |  |  |  |  |  |  | 615,000,000 |
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% |  |  |  |  | 4.625% |  |  |
Long-term debt, gross |  |  | $ 1,075,000,000 |  |  |  |  |  |  | 0 |
6.5% Senior Secured Notes due 2025 | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original Principal |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Annual Interest Rate |  |  | 6.50% |  |  |  |  |  |  |  | 6.50%
Long-term debt, gross |  |  | $ 500,000,000 |  |  |  |  |  |  | 500,000,000 |
Standard Bank Term Loan Facility |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Original Principal |  |  | 222,000,000 |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 88,000,000 |  |  |  |  |  |  | 115,000,000 |
Average effective interest rate |  |  | 6.50% | 6.50% | 6.50% | 9.50% |  |  |  |  |
Repayment of debt |  |  | $ 17,000,000 | R 260 |  |  |  |  |  |  |
Standard Bank Term Loan Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Repayment of debt | $ 53,000,000 | R 780 |  |  |  |  |  |  |  |  |
Tikon Loan |  |  |  |  |  |  |  |  |  |  |
Long-term debt, net of an unamortized discount and debt issuance costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | 11,000,000 |  |  |  |  |  |  | 17,000,000 |
Repayment of debt |  |  | 6,000,000 |  | ¥ 41 |  |  |  |  |  |
Australian Government Loan, net of unamortized discount |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  | $ 35,000,000 |  |  |  |  |  |  | $ 36,000,000 |

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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 http://asc.fasb.org/extlink&oid=120520924&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 http://asc.fasb.org/extlink&oid=120400017&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 http://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 http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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