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Supplemental financial information - Amounts Reclassified out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other income (expense), net (OI&E) $ 46 $ 25
Provision for income taxes (186) (50)
Net income 1,753 1,174
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] 11 10
Provision for income taxes (3) (2)
Net income $ 8 $ 8
[1] Detailed in Note 5.