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Supplemental financial information - Amounts Reclassified out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other income (expense), net (OI&E) $ 15 $ 27 $ 134 $ 151
Provision for income taxes (328) (234) (825) (183)
Net income 1,947 1,353 5,631 3,907
Reclassification out of Accumulated Other Comprehensive Income | Net actuarial losses of defined benefit plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other income (expense), net (OI&E) [1] 10 9 31 28
Provision for income taxes (2) (2) (7) (7)
Net income 8 7 24 21
Reclassification out of Accumulated Other Comprehensive Income | Prior service credit of defined benefit plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other income (expense), net (OI&E) [1] (1) (1) (1) (1)
Provision for income taxes 0 0 0 0
Net income $ (1) $ (1) $ (1) $ (1)
[1] Detailed in Note 5.