XML 360 R102.htm IDEA: XBRL DOCUMENT v3.23.1
Accounting policies - Summary of Key assumptions used in the Income and Market Approach (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
$ / oz
Dec. 31, 2021
$ / oz
Dec. 31, 2022
R / kg
Dec. 31, 2022
$ / oz
Dec. 31, 2021
R / kg
Dec. 31, 2021
$ / oz
Dec. 31, 2020
$ / oz
Dec. 31, 2020
R / kg
Dec. 31, 2020
$ / oz
Disclosure of Detailed Information of Key Assumptions Used in the Income and Market Approach Explanatory [line items]                  
Resource value per ounce 44 0              
Discount rates – real 19.30% 9.00%              
Life-of-mine 6 years 6 years              
Resource valuation | $ $ 40                
45% Basis                  
Disclosure of Detailed Information of Key Assumptions Used in the Income and Market Approach Explanatory [line items]                  
Resource valuation | $ $ 18                
Year 1 - 3 | Bottom of range                  
Disclosure of Detailed Information of Key Assumptions Used in the Income and Market Approach Explanatory [line items]                  
Gold price per ounce/kg 1,650 1,600              
Year 1 - 3 | Top of range                  
Disclosure of Detailed Information of Key Assumptions Used in the Income and Market Approach Explanatory [line items]                  
Gold price per ounce/kg 1,740 1,750              
Year 4                  
Disclosure of Detailed Information of Key Assumptions Used in the Income and Market Approach Explanatory [line items]                  
Gold price per ounce/kg 1,650 1,550 900,000 2,250 780,000 2,070 1,500 750,000 2,000
Year Four Onwards                  
Disclosure of Detailed Information of Key Assumptions Used in the Income and Market Approach Explanatory [line items]                  
Gold price per ounce/kg 1,620 1,550