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Analysis of Net Debt - Schedule of Liquidity and Capital Resources Related to Cash Generation and Changes in Our Cash and Cash Equivalents Position (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Cash Generation And Changes In Our Cash And Cash Equivalents Position [abstract]        
Net cash inflow from operating activities $ 3,954 $ 4,210 [1] $ 3,938 [1]  
Net cash outflow from investing activities (884) (2,546) [1] (1,060) [1]  
Net cash (outflow)/inflow from financing activities (2,686) (3,305) [1] 287 [1]  
Increase/(decrease) in cash and cash equivalents 384 (1,641) [1] 3,165 [1]  
Cash and cash equivalents at 1 January [1] 5,783 7,721 4,218  
Effect of exchange rate changes (231) (297) [1] 338 [1]  
Cash and cash equivalents at 31 December 5,936 5,783 [1] 7,721 [1]  
Derivative financial instruments - non-financing (16) 0 0  
Lease liabilities (1,319) (1,671) (1,635)  
Bank overdrafts (94) (111) (120)  
Borrowings (9,542) (10,376) (12,095)  
Derivative financial instruments - financing (70) 122 188  
Total liabilities from financing activities (11,025) (12,036) (13,662)  
Group net debt $ (5,105) $ (6,253) $ (5,941) $ (7,532)
[1] See the Accounting Policies on page 181 for further details.