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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