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Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Interest rate swaps \| Fair Value, Inputs, Level 2
Fair Value [Abstract]
Derivative asset	$ 3	$ 0
Derivative liability	0	25
Natural Gas Hedges \| Fair Value, Inputs, Level 2
Fair Value [Abstract]
Derivative asset	3	1
Derivative liability	0	0
Currency Contracts \| Fair Value, Inputs, Level 2
Fair Value [Abstract]
Derivative asset	27	3
Derivative liability	0	1
Term Loan Facility \| Fair Value, Inputs, Level 1
Fair Value [Abstract]
Fair value of debt	887	895
Standard Bank Term Loan Facility \| Fair Value, Inputs, Level 2
Fair Value [Abstract]
Fair value of debt	$ 98	92
Senior Notes due 2029
Fair Value [Abstract]
Interest rate	4.63%		4.625%
Senior Notes due 2029 \| Fair Value, Inputs, Level 1
Fair Value [Abstract]
Fair value of debt	$ 1,008	1,071
6.5% Senior Secured Notes due 2025 \| Senior Notes
Fair Value [Abstract]
Interest rate	6.50%
6.5% Senior Secured Notes due 2025 \| Fair Value, Inputs, Level 1
Fair Value [Abstract]
Fair value of debt	$ 518	526
Australian Government Loan \| Fair Value, Inputs, Level 2
Fair Value [Abstract]
Fair value of debt	1	1
MGT Loan \| Fair Value, Inputs, Level 2
Fair Value [Abstract]
Fair value of debt	$ 32	$ 33