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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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Number Of Voluntary Prepayments

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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.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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