Supplemental financial information - Amounts Reclassified out of AOCI (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net (OI&E)		$ 130	$ 119	$ 253	$ 199
Provision for income taxes		(120)	(280)	(308)	(518)
Net income		1,127	1,722	2,232	3,430
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	4	7	8
Provision for income taxes		(1)	(1)	(2)	(2)
Net income		$ 3	$ 3	$ 5	$ 6

[1] Detailed in Note 5