Transactions with Related Parties - Transactions with related parties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction
Payable to Caterpillar - other	$ 106	$ 137
Notes receivable from Caterpillar	663	559	$ 527
Interest expense	1,388	1,287	1,033
Revenue earned	611	625	617
Purchased Receivables as of December 31,	33,099	29,231
Finance receivables, net	32,815	28,964
Equipment on operating leases, net	2,927	2,780
Revenues	3,634	3,489	3,248
Depreciation on equipment leased to others	699	722	713
Caterpillar Purchased Receivables
Related Party Transaction
Purchased Receivables as of December 31,	5,500	4,283	3,949
Caterpillar
Related Party Transaction
Payable to Caterpillar - borrowings	1,024	10	24
Payable to Caterpillar - other	148	118	113
Other receivables from Caterpillar	163	85	39
Interest expense	28	1	1
Interest income on Notes Receivable with Caterpillar	26	23	21
Purchases made	55,656	52,930	53,382
Revenue earned	611	625	617
Finance receivables, net	272	163	109
Equipment on operating leases, net	97	115	46
Revenues	42	31	27
Depreciation on equipment leased to others	$ 19	$ 18	$ 18