Supplemental financial information - Amounts Reclassified out of AOCI (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net (OI&E)		$ 119	$ 7	$ 199	$ 22
Provision for income taxes		(280)	(390)	(518)	(715)
Net income		1,722	2,291	3,430	4,492
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]	4	20	8	23
Provision for income taxes		(1)	(4)	(2)	(5)
Net income		$ 3	$ 16	$ 6	$ 18

[1] Detailed in Note 5