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Financial risk management - D.1.1. Fixed and floating rate debt (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 5,691 $ 5,972
Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 5,691 5,972
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on profit before tax $ 9 14
1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 113 186
1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 107 155
2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 439 145
3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 811 517
4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 467 1,085
Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 3,755 $ 3,884
Weighted average | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.90% 4.82%
Weighted average | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.65% 5.10%
Weighted average | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.95% 4.55%
Weighted average | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 5.76% 4.34%
Weighted average | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.15% 5.81%
Weighted average | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 5.09% 4.73%
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 5.21% 5.24%
Fixed interest rate | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 4,766 $ 4,543
Fixed interest rate | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 80 118
Fixed interest rate | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 90 117
Fixed interest rate | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 268 118
Fixed interest rate | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 561 332
Fixed interest rate | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 269 431
Fixed interest rate | Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 3,498 3,428
Floating interest rate | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 926 1,429
Floating interest rate | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 33 68
Floating interest rate | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 17 38
Floating interest rate | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 171 27
Floating interest rate | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 250 185
Floating interest rate | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 197 654
Floating interest rate | Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 256 $ 457