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Changes in Equity and Earnings per Share - Summary of Changes in Issued Capital and Treasury Shares (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2026 USD ($) shares | Jun. 30, 2026 EUR (€) shares | Jun. 30, 2025 USD ($)
Disclosure of classes of share capital [line items] |  |  |
At the end of the previous year | shares | 2,019,000,000 | 2,019,000,000 |
Changes during the period | shares | 0 | 0 |
At the end of the current year | shares | 2,019,000,000 | 2,019,000,000 |
At the end of the previous year | $ 1,736 |  |
Changes during the period | 0 |  |
At the end of the current year | 1,736 | € 1,238,608,344.12 |
Changes during the period | $ 128 |  | $ (1,717)
Ordinary shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
At the end of the current year | shares | 1,797,000,000 | 1,797,000,000 |
Treasury shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Restricted shares | shares | 222,037,958 | 222,037,958 |
At the end of the previous year | shares | 68,500,000 | 68,500,000 |
Changes during the period | shares | (20,800,000) | (20,800,000) |
At the end of the current year | shares | 47,700,000 | 47,700,000 |
Result on the use of treasury shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
At the end of the previous year | $ (6,316) |  |
Changes during the period | (1,439) |  |
At the end of the current year | (7,755) |  |
Treasury shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
At the end of the previous year | (5,083) |  |
Changes during the period | 1,567 |  | $ (1,138)
At the end of the current year | $ (3,516) |  |

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