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Share capital - Summary of Issued and Fully Paid Ordinary Shares (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2026 | Jun. 30, 2025
Disclosure of classes of share capital [line items] |  |  |
Repurchases of shares |  | $ (4,931) | $ (7,038)
Share capital |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance (in shares) |  | 5,718,636,398 | 6,115,031,158
Beginning balance |  | $ 477 | $ 510
Repurchases of shares (in shares) |  | (147,708,271) | (202,687,052)
Repurchases of shares | [1] | $ (12) | $ (17)
Ending balance (in shares) |  | 5,570,928,127 | 5,912,344,106
Ending balance |  | $ 465 |
Share capital | Ordinary shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Ending balance |  |  | $ 493
[1] | See Note 4 “Share capital”.

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