Variable interest entities - Schedule of carrying amount of assets and liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 4,198	$ 3,720	$ 2,978
Accounts receivable, net	6,961	4,820	6,422
Inventories	5,019	4,755	4,644
Other current assets	584	749	694
Total current assets	16,852	14,083	14,840
Property, plant and equipment, net	23,783	21,452	21,289
Goodwill	12,676	11,061	10,906	$ 9,158
Intangible assets, net	2,146	1,211	1,105
Operating lease right-of-use assets, net	1,412	1,274	1,322
Other noncurrent assets	915	795	830
Total assets	58,527	50,613	51,221
Current liabilities:
Accounts payable	3,156	3,207	2,963
Accrued expenses	2,393	2,248	2,513
Current portion of long-term debt	3,845	2,882	3,065
Operating lease liabilities	257	265	271
Other current liabilities	1,822	1,577	1,703
Total current liabilities	11,596	10,296	10,668
Long-term debt	14,734	10,969	10,672
Deferred income tax liabilities	3,595	3,105	3,168
Noncurrent operating lease liabilities	1,188	1,074	1,117
Other noncurrent liabilities	2,785	2,319	2,430
Total liabilities	33,898	27,763	28,055
Variable interest entity, primary beneficiary
Current assets:
Cash and cash equivalents	17	21	20
Accounts receivable, net	41	38	39
Inventories	88	96	101
Other current assets	62	58	56
Total current assets	208	213	216
Property, plant and equipment, net	812	846	882
Goodwill	190	190	197
Intangible assets, net	0	1	0
Operating lease right-of-use assets, net	4	5	5
Other noncurrent assets	10	9	13
Total assets	1,224	1,264	1,313
Current liabilities:
Accounts payable	114	106	80
Accrued expenses	36	44	52
Current portion of long-term debt	12	33	77
Operating lease liabilities	1	1	1
Other current liabilities	20	25	23
Total current liabilities	183	209	233
Long-term debt	377	345	329
Deferred income tax liabilities	91	94	98
Noncurrent operating lease liabilities	3	4	4
Other noncurrent liabilities	23	21	20
Total liabilities	$ 677	$ 673	$ 684