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Financial risk management - D.1.1. Fixed and floating rate debt (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 4,580 $ 3,785
Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 4,580 3,785
Reasonably possible change in risk variable, percent 1.00%  
Reasonably possible change in risk variable, impact on profit before tax $ 15 13
1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 458 185
1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 337 500
2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 403 347
3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 569 431
4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 468 584
Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 2,345 $ 1,738
Weighted average | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.95% 5.94%
Weighted average | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 9.08% 5.61%
Weighted average | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 6.23% 4.68%
Weighted average | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.06% 8.35%
Weighted average | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 5.18% 11.65%
Weighted average | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 4.28% 5.88%
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 5.76% 6.52%
Fixed interest rate | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 3,115 $ 2,462
Fixed interest rate | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 140 87
Fixed interest rate | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 162 365
Fixed interest rate | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 137 141
Fixed interest rate | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 436 104
Fixed interest rate | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 204 396
Fixed interest rate | Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 2,036 $ 1,369
Fixed interest rate | Weighted average | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 6.34% 7.48%
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 6.35% 7.17%
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 6.59% 5.52%
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 6.64% 8.28%
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 6.61% 9.92%
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 4.10% 7.73%
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 6.47% 7.68%
Floating interest rate | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 1,465 $ 1,323
Floating interest rate | 1 year | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 319 98
Floating interest rate | 1–2 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 175 134
Floating interest rate | 2–3 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 266 206
Floating interest rate | 3–4 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 133 327
Floating interest rate | 4–5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 263 188
Floating interest rate | Greater than 5 years | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt $ 309 $ 370
Floating interest rate | Weighted average | Interest rate risk    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Borrowings, interest rate 1.98% 3.06%
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 10.28% 4.24%
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 5.89% 2.37%
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 2.73% 8.40%
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 0.49% 12.20%
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 4.41% 1.98%
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 1.13% 2.25%