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Financial risk management - D.1.1. Fixed and floating rate debt (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 6,804 | $ 7,744
Reasonably possible change in risk variable, percent | 1.00% |
Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 6,804 | 7,744
Reasonably possible change in risk variable, impact on profit before tax | 12 | 28
1 year | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 180 | 1,840
1–2 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 394 | 206
2–3 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 564 | 487
3–4 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 777 | 843
4–5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 1,122 | 758
Greater than 5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 3,766 | $ 3,610
Weighted average | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 6.22% | 5.55%
Weighted average | 1 year | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 7.68% | 1.93%
Weighted average | 1–2 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 5.71% | 5.97%
Weighted average | 2–3 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 6.11% | 5.47%
Weighted average | 3–4 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 7.46% | 5.86%
Weighted average | 4–5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Borrowings, interest rate | 6.49% | 5.11%
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 | 5.88% | 5.34%
Fixed rate loans | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 5,574 | $ 4,956
Fixed rate loans | 1 year | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 131 | 91
Fixed rate loans | 1–2 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 383 | 151
Fixed rate loans | 2–3 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 501 | 460
Fixed rate loans | 3–4 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 376 | 662
Fixed rate loans | 4–5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 718 | 372
Fixed rate loans | Greater than 5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 3,466 | 3,219
Variable rate loans | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 1,230 | 2,789
Variable rate loans | 1 year | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 49 | 1,750
Variable rate loans | 1–2 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 12 | 55
Variable rate loans | 2–3 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 63 | 26
Variable rate loans | 3–4 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 402 | 181
Variable rate loans | 4–5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | 404 | 386
Variable rate loans | Greater than 5 years | Interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Debt | $ 300 | $ 391

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