Share-based compensation plans and shares held in trust - Schedule of Share Awards Under the PSP and LTIP (Details) - Share awards under PSP and LTIP - shares shares in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Disclosure Of Share Based Compensation Expense [Line Items] | |||
| Weighted average remaining contractual life (years) | 10 months 24 days | 10 months 24 days | 1 year 1 month 6 days |
| Number of ordinary shares (million) | |||
| Disclosure Of Share Based Compensation Expense [Line Items] | |||
| Beginning balance (in shares) | 58 | 58 | |
| Granted (in shares) | 20 | 19 | |
| Vested (in shares) | (26) | (17) | |
| Forfeited (in shares) | (3) | (2) | |
| Ending balance (in shares) | 49 | 58 | 58 |
| Number of ADSs (million) | |||
| Disclosure Of Share Based Compensation Expense [Line Items] | |||
| Beginning balance (in shares) | 10 | 10 | |
| Granted (in shares) | 3 | 3 | |
| Vested (in shares) | (4) | (3) | |
| Forfeited (in shares) | 0 | 0 | |
| Ending balance (in shares) | 9 | 10 | 10 |