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Financial risk management - D.1.1. Fixed and floating rate debt (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 5,972 $ 4,580
Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 5,972 4,580
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on profit before tax $ 14 15
1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 186 458
1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 155 337
2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 145 403
3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 517 570
4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 1,085 468
Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 3,884 $ 2,345
Weighted average | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.82% 4.95%
Weighted average | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 5.10% 9.08%
Weighted average | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.55% 6.23%
Weighted average | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.34% 4.06%
Weighted average | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 5.81% 5.18%
Weighted average | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.73% 4.28%
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 5.24% 5.76%
Fixed interest rate | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 4,543 $ 3,116
Fixed interest rate | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 118 140
Fixed interest rate | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 117 162
Fixed interest rate | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 118 137
Fixed interest rate | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 332 436
Fixed interest rate | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 431 204
Fixed interest rate | Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 3,428 $ 2,036
Fixed interest rate | Weighted average | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 5.86% 6.34%
Fixed interest rate | Weighted average | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 6.32% 6.35%
Fixed interest rate | Weighted average | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 5.46% 6.59%
Fixed interest rate | Weighted average | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 5.01% 6.64%
Fixed interest rate | Weighted average | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 7.24% 6.61%
Fixed interest rate | Weighted average | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 5.44% 4.10%
Fixed interest rate | 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 5.81% 6.47%
Floating interest rate | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 1,429 $ 1,465
Floating interest rate | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 68 318
Floating interest rate | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 38 175
Floating interest rate | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 27 266
Floating interest rate | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 185 133
Floating interest rate | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 654 263
Floating interest rate | Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 457 $ 309
Floating interest rate | Weighted average | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 1.52% 1.98%
Floating interest rate | Weighted average | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 2.97% 10.28%
Floating interest rate | Weighted average | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 1.77% 5.89%
Floating interest rate | Weighted average | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 1.41% 2.73%
Floating interest rate | Weighted average | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 3.25% 0.49%
Floating interest rate | Weighted average | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.26% 4.41%
Floating interest rate | 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 0.96% 1.13%