Short-term borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Short-term borrowings:
Short-term borrowings	$ 4,393	$ 4,643
Notes payable to banks
Short-term borrowings:
Weighted-average interest rates on short-term borrowings (as a percent)	10.80%	10.00%
Commercial paper
Short-term borrowings:
Weighted-average interest rates on short-term borrowings (as a percent)	4.50%	5.20%
Demand notes
Short-term borrowings:
Weighted-average interest rates on short-term borrowings (as a percent)	4.20%	5.20%
Machinery, Energy & Transportation
Short-term borrowings:
Short-term borrowings	$ 0	$ 0
Machinery, Energy & Transportation | Notes payable to banks
Short-term borrowings:
Short-term borrowings	0	0
Financial Products
Short-term borrowings:
Short-term borrowings	4,393	4,643
Financial Products | Notes payable to banks
Short-term borrowings:
Short-term borrowings	165	330
Financial Products | Commercial paper
Short-term borrowings:
Short-term borrowings	3,946	4,069
Financial Products | Demand notes
Short-term borrowings:
Short-term borrowings	$ 282	$ 244