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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Cash Generation And Changes In Our Cash And Cash Equivalents Position [abstract]        
Net cash inflow from operating activities $ 4,210 $ 3,938 $ 3,881  
Net cash (outflow)/inflow from investing activities (2,546) (1,060) 217  
Net cash inflow/(outflow) from financing activities (3,305) 287 (2,546)  
(Decrease)/increase in cash and cash equivalents (1,641) 3,165 1,552  
Cash and cash equivalents at 1 January 7,721 4,218 2,686  
Effect of exchange rate changes (297) 338 (20)  
Cash and cash equivalents at 31 December 5,783 7,721 4,218  
Lease liabilities (1,671) (1,635) (1,697)  
Bank overdrafts (excluding those in notional cash pooling arrangements) (111) (120) (46)  
Borrowings (10,376) (12,095) (10,081)  
Derivative financial instruments 122 188 74  
Total liabilities from financing activities (12,036) (13,662) (11,750)  
Group net debt $ (6,253) $ (5,941) $ (7,532) $ (7,998)