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Derivative instruments (Summary of Income and Expense Line Items) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Total revenues $ 6,706 $ 6,423 $ 19,133 $ 18,790
Other income, net 73 55 97 69
Interest expense, net (296) (302) (862) (944)
Interest rate swap agreements [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on fair value hedging relationships, Hedged items 54 35 195 215
Gains (losses) on fair value hedging relationships, Derivatives designated as hedging instruments (31) (13) (128) (150)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedges [Member] | Cross-currency swap contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Other income, net (104) 183 (190) 101
Product sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total revenues 6,320 6,104 18,026 17,906
Product sales [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash flow hedges [Member] | Foreign currency contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total revenues $ (5) $ 41 $ (24) $ 158