Variable interest entities - Schedule of carrying amount of assets and liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Assets
Cash and cash equivalents	$ 3,308	$ 6,341	$ 4,650
Accounts receivable, net	4,798	4,507	4,706
Inventories	4,619	4,291	4,458
Other current assets	748	478	416
Total current assets	13,709	16,885	14,230
Property, plant and equipment, net	18,878	17,841	17,997
Goodwill	10,125	9,158	9,308	$ 9,199
Operating lease right-of-use assets, net	1,285	1,292	1,192
Other noncurrent assets	634	632	631
Total assets	46,333	47,469	45,107
Liabilities
Accounts payable	2,730	3,149	2,627
Accrued expenses	2,241	2,296	2,079
Current portion of long-term debt	2,874	1,759	2,095
Operating lease liabilities	255	255	235
Other current liabilities	1,735	2,072	2,063
Total current liabilities	9,997	10,013	9,255
Long-term debt	9,680	9,776	7,583
Deferred income tax liabilities	2,684	2,738	2,972
Noncurrent operating lease liabilities	1,120	1,125	1,021
Other noncurrent liabilities	2,110	2,196	2,132
Total liabilities	25,591	25,848	22,963
Variable interest entity, primary beneficiary
Assets
Cash and cash equivalents	29	19	37
Accounts receivable, net	30	31	34
Inventories	106	99	121
Other current assets	54	51	49
Total current assets	219	200	241
Property, plant and equipment, net	897	923	969
Goodwill	196	200	507
Operating lease right-of-use assets, net	5	5	6
Other noncurrent assets	10	11	9
Total assets	1,327	1,339	1,732
Liabilities
Accounts payable	95	92	95
Accrued expenses	37	36	43
Current portion of long-term debt	87	98	89
Operating lease liabilities	1	1	1
Other current liabilities	24	25	25
Total current liabilities	244	252	253
Long-term debt	312	297	353
Deferred income tax liabilities	104	106	112
Noncurrent operating lease liabilities	4	5	5
Other noncurrent liabilities	18	17	15
Total liabilities	$ 682	$ 677	$ 738