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Condensed parent company financial information - Condensed Parent Company statement of cash flows (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Parent Company Statement of Cash Flows [Line Items] |  |  |
Profit for the year | $ 628 | $ 750 | $ 376
Adjustments for: |  |  |
Administrative expenses | 359 | 338 | 353
Net financial expenses | 140 | 52 | 96
Income tax charge | 269 | 260 | 164
Total adjustments | 521 | 469 | 585
Cash flow from operations | 1,149 | 1,219 | 961
Interest received | 57 | 36 | 22
Interest paid | (170) | (119) | (126)
Net cash from operating activities | 724 | 893 | 646
Cash flow from investing activities |  |  |
Net cash from investing activities | (99) | (137) | (78)
Cash flow from financing activities |  |  |
Repurchase of shares, including taxes and transaction costs | (804) | (790) | (482)
Dividends paid to shareholders | (259) | (245) | (233)
Repayment of long-term bonds | (547) | 0 | (209)
Settlement of currency swaps | (45) | 0 |
Net cash from financing activities | (894) | (417) | (961)
Net movement in cash and cash equivalents in the year | (269) | 339 | (393)
Cash and cash equivalents at beginning of the year | 1,278 | 921 | 1,391
Exchange rate effects | (18) | 18 | (77)
Cash and cash equivalents at end of the year | 991 | 1,278 | 921
Parent Company [member] |  |  |
Parent Company Statement of Cash Flows [Line Items] |  |  |
Profit for the year | 725 | 1,844 | 796
Adjustments for: |  |  |
Administrative expenses | 2 | 2 | 2
Net financial expenses | 51 | 47 | 81
Dividend income from subsidiary undertakings | (762) | (1,877) | (858)
Income tax charge | (16) | (16) | (21)
Total adjustments | (725) | (1,844) | (796)
Changes in amounts due from related parties: operating activities | 7 | 9 | 10
Cash flow from operations | 7 | 9 | 10
Interest received | 30 | 29 | 4
Interest paid | (84) | (74) | (80)
Net cash from operating activities | (47) | (36) | (66)
Cash flow from investing activities |  |  |
Dividend received from subsidiary undertaking | 762 | 1,877 | 858
Changes in amounts due from related parties: investing activities | 930 | (824) | 132
Net cash from investing activities | 1,692 | 1,053 | 990
Cash flow from financing activities |  |  |
Repurchase of shares, including taxes and transaction costs | (804) | (790) | (482)
Dividends paid to shareholders | (259) | (245) | (233)
Repayment of long-term bonds | (547) | 0 | (209)
Settlement of currency swaps | (45) | 0 | 0
Changes in amounts due from related parties: financing activities | 10 | 18 | 0
Net cash from financing activities | (1,645) | (1,017) | (924)
Net movement in cash and cash equivalents in the year | 0 | 0 | 0
Cash and cash equivalents at beginning of the year | 0 | 0 | 0
Exchange rate effects | 0 | 0 | 0
Cash and cash equivalents at end of the year | $ 0 | $ 0 | $ 0

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