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Supplemental financial information - Amounts reclassified out of accumulated other comprehensive income (loss), net of taxes, to net income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other income (expense), net (OI&E)                 $ 313 $ 175 $ 98
Provision for income taxes                 (422) (711) (1,106)
Net income $ 1,688 $ 1,353 $ 1,380 $ 1,174 $ 1,070 $ 1,425 $ 1,305 $ 1,217 5,595 5,017 5,580
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]                 38 51 65
Provision for income taxes                 (9) (13) (15)
Net income                 29 38 50
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) 0 (4)
Provision for income taxes                 0 0 1
Net income                 $ (1) $ 0 $ (3)
[1] Detailed in Note 8.