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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

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