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Derivative instruments (Summary of Income and Expense Line Items) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Other income, net $ 11 $ 3 $ 24 $ 14
Interest expense, net (281) (296) (566) (642)
Interest rate swap agreements [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) on fair value hedging relationships, Hedged items (34) (30) 141 180
Gains (losses) on fair value hedging relationships, Derivatives designated as hedging instruments 55 53 (97) (137)
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 46 51 (86) (82)
Product sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Product sales 6,114 5,908 11,706 11,802
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]        
Product sales $ (18) $ 68 $ (19) $ 117