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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)