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Supplemental financial information - Amounts Reclassified out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other income (expense), net (OI&E) $ 73 $ 99 $ 119 $ 124
Provision for income taxes (311) 101 (497) 51
Net income 1,931 1,380 3,684 2,554
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 21 19
Provision for income taxes (2) (3) (5) (5)
Net income $ 8 $ 6 $ 16 $ 14
[1] Detailed in Note 5.