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Changes in Equity and Earnings Per Share - Summary of Changes in Other Comprehensive Income Reserves (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2026 | Jun. 30, 2025
Other comprehensive income/(loss) |  |
Other comprehensive income/(loss) | $ 2,859 | $ 2,620
Translation reserves [member] |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |
Beginning balance | (32,076) | (38,670)
Other comprehensive income/(loss) |  |
Exchange differences on translation of foreign operations (gains/(losses)) | 2,857 | 2,694
Other comprehensive income/(loss) | 2,857 | 2,694
Ending balance | (29,219) | (35,976)
Hedging reserves [member] |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |
Beginning balance | 390 | 490
Other comprehensive income/(loss) |  |
Cash flow hedges | 61 | (255)
Other comprehensive income/(loss) | 61 | (255)
Ending balance | 451 | 235
Post- employment benefits [member] |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |
Beginning balance | (954) | (1,020)
Other comprehensive income/(loss) |  |
Other comprehensive income/(loss) | 0 | 0
Ending balance | (954) | (1,020)
OCI reserves [member] |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |
Beginning balance | (32,641) | (39,201)
Other comprehensive income/(loss) |  |
Exchange differences on translation of foreign operations (gains/(losses)) | 2,857 | 2,694
Cash flow hedges | 61 | (255)
Other comprehensive income/(loss) | 2,918 | 2,439
Ending balance | $ (29,722) | $ (36,762)

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