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Commitments And Contingencies (Details) - Mt Todd, Australia - AUD ($)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2020
Dec. 31, 2021
Loss Contingencies [Line Items]    
Percentage of ownership in project   100.00%
Scenario, Plan    
Loss Contingencies [Line Items]    
Mine Reclamation and Closing Liability, Noncurrent   $ 73
Scenario, Plan | Jawoyn Association Aboriginal Corporation    
Loss Contingencies [Line Items]    
Percentage of ownership in project 10.00%  
Percentage of royalty on gold   1.00%
Scenario, Plan | Minimum | Jawoyn Association Aboriginal Corporation    
Loss Contingencies [Line Items]    
Gross Proceeds Royalty, Additional Contingent Gross Proceeds Royalty, Percent   0.125%
Gross Proceeds Royalty, Including Contingent Additional Gross Proceeds Royalty, Percent   1.125%
Scenario, Plan | Maximum | Jawoyn Association Aboriginal Corporation    
Loss Contingencies [Line Items]    
Gross Proceeds Royalty, Additional Contingent Gross Proceeds Royalty, Percent   2.00%
Gross Proceeds Royalty, Including Contingent Additional Gross Proceeds Royalty, Percent   3.00%