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Financial risk management - D.1.1. Fixed and floating rate debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 6,804 $ 7,744
Reasonably possible change in risk variable, percent 1.00%  
Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 6,804 7,744
Reasonably possible change in risk variable, impact on profit before tax 12 28
1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 180 1,840
1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 394 206
2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 564 487
3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 777 843
4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 1,122 758
Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 3,766 $ 3,610
Weighted average | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 6.22% 5.55%
Weighted average | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 7.68% 1.93%
Weighted average | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 5.71% 5.97%
Weighted average | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 6.11% 5.47%
Weighted average | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 7.46% 5.86%
Weighted average | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 6.49% 5.11%
Weighted average | Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 5.88% 5.34%
Fixed rate loans | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 5,574 $ 4,956
Fixed rate loans | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 131 91
Fixed rate loans | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 383 151
Fixed rate loans | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 501 460
Fixed rate loans | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 376 662
Fixed rate loans | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 718 372
Fixed rate loans | Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 3,466 3,219
Variable rate loans | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 1,230 2,789
Variable rate loans | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 49 1,750
Variable rate loans | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 12 55
Variable rate loans | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 63 26
Variable rate loans | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 402 181
Variable rate loans | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 404 386
Variable rate loans | Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 300 $ 391