Variable interest entities - Schedule of carrying amount of assets and liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 3,240	$ 4,096	$ 3,352
Accounts receivable, net	5,213	5,178	5,141
Inventories	5,058	5,251	4,960
Other current assets	877	678	789
Total current assets	16,239	15,254	14,242
Property, plant and equipment, net	24,657	24,937	22,179
Goodwill	12,592	13,099	11,475	$ 11,061
Intangible assets, net	1,956	2,048	1,208
Operating lease right-of-use assets, net	1,274	1,471	1,272
Other noncurrent assets	962	1,018	813
Total assets	58,167	58,329	51,921
Current liabilities:
Accounts payable	2,947	3,263	2,777
Accrued expenses	2,143	2,196	2,270
Current portion of long-term debt	2,367	1,055	1,365
Operating lease liabilities	247	286	247
Other current liabilities	1,968	1,834	1,960
Total current liabilities	10,211	8,754	8,712
Long-term debt	16,071	16,478	14,213
Deferred income tax liabilities	3,301	3,511	3,141
Noncurrent operating lease liabilities	1,066	1,232	1,075
Other noncurrent liabilities	2,973	2,876	2,423
Total liabilities	33,622	32,851	29,564
Variable interest entity, primary beneficiary
Current assets:
Cash and cash equivalents	30	40	18
Accounts receivable, net	39	42	43
Inventories	79	81	88
Other current assets	35	39	60
Total current assets	183	202	209
Property, plant and equipment, net	760	793	845
Goodwill	182	187	193
Intangible assets, net	0	0	1
Operating lease right-of-use assets, net	4	4	5
Other noncurrent assets	9	9	9
Total assets	1,138	1,195	1,262
Current liabilities:
Accounts payable	103	119	94
Accrued expenses	36	33	43
Current portion of long-term debt	316	13	55
Operating lease liabilities	1	1	1
Other current liabilities	16	21	23
Total current liabilities	472	187	216
Long-term debt	73	377	343
Deferred income tax liabilities	85	89	94
Noncurrent operating lease liabilities	3	3	4
Other noncurrent liabilities	21	21	22
Total liabilities	$ 654	$ 677	$ 679