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Derivative instruments (Summary of Income and Expense Line Items) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]    
Total revenues $ 6,105 $ 6,238
Other income (expense), net 2,064 (530)
Interest expense, net (543) (295)
Interest rate swap agreements    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) on fair value hedging relationships, Hedged items (88) 337
Gains (losses) on fair value hedging relationships, Derivatives designated as hedging instruments 114 (315)
Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges | Cross-currency swap contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Other income (expense), net (22) (78)
Product sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Total revenues 5,846 5,731
Product sales | Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges | Foreign currency forward contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Total revenues $ 52 $ 27