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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%

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