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Changes in Equity and Earnings Per Share - Summary of Changes in Other Comprehensive Income Reserves (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other comprehensive income/(loss) |  |  |
Exchange differences on translation of foreign operations (gains/(losses)) | $ (4,525) | $ (10,473) | $ 790
Cash flow hedges | 140 | 206 | (110)
Cash flow hedges and cumulative translation adjustments reclassified from equity to profit or loss in relation to Australia divestiture |  | 426 |
Re-measurements of post-employment benefits | 504 | (263) | (182)
Total Other comprehensive income/(loss) | 2,233 | (7,901) | 10,912
Translation reserves [member] |  |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |  |
Beginning balance | (29,234) | (19,936) | (21,079)
Other comprehensive income/(loss) |  |  |
Exchange differences on translation of foreign operations (gains/(losses)) | (4,320) | (9,943) | 1,143
Cash flow hedges and cumulative translation adjustments reclassified from equity to profit or loss in relation to Australia divestiture |  | 645 |
Total Other comprehensive income/(loss) | (4,320) | (9,298) | 1,143
Ending balance | (33,554) | (29,234) | (19,936)
Hedging reserves [member] |  |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |  |
Beginning balance | 376 | 397 | 494
Other comprehensive income/(loss) |  |  |
Cash flow hedges | 105 | 198 | (97)
Cash flow hedges and cumulative translation adjustments reclassified from equity to profit or loss in relation to Australia divestiture |  | (219) |
Total Other comprehensive income/(loss) | 105 | (21) | (97)
Ending balance | 481 | 376 | 397
Post- employment benefits [member] |  |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |  |
Beginning balance | (1,983) | (1,740) | (1,567)
Other comprehensive income/(loss) |  |  |
Re-measurements of post-employment benefits | 479 | (243) | (173)
Total Other comprehensive income/(loss) | 479 | (243) | (173)
Ending balance | (1,504) | (1,983) | (1,740)
OCI reserves [member] |  |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |  |
Beginning balance | (30,841) | (21,279) | (22,152)
Other comprehensive income/(loss) |  |  |
Exchange differences on translation of foreign operations (gains/(losses)) | (4,320) | (9,943) | 1,143
Cash flow hedges | 105 | 198 | (97)
Cash flow hedges and cumulative translation adjustments reclassified from equity to profit or loss in relation to Australia divestiture |  | 426 |
Re-measurements of post-employment benefits | 479 | (243) | (173)
Total Other comprehensive income/(loss) | (3,736) | (9,562) | 873
Ending balance | $ (34,577) | $ (30,841) | $ (21,279)

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