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Debt - Notes payable and bank lines (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Uncommitted and committed bank lines    
Debt    
Weighted average interest rate (as a percent) 7.03% 2.71%
Uncommitted bank lines    
Debt    
Lines of credit $ 326 $ 359
Compensating balance 3  
Uncommitted bank lines | Denominated in foreign currencies    
Debt    
Lines of credit 194 218
Uncommitted bank lines | South African Rand    
Debt    
Lines of credit 174 177
Committed bank line    
Debt    
Lines of credit 131 $ 157
Maximum capacity $ 250