Cat Financial Financing Activities - Financing receivable, nonaccrual (Details) - Finance Receivables - Customer - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	$ 163	$ 176
91+ Still Accruing	28	30
North America
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	90	83
91+ Still Accruing	20	20
EAME
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	35	33
91+ Still Accruing	5	5
Asia/Pacific
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	4	5
91+ Still Accruing	2	5
Latin America
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	24	24
91+ Still Accruing	1	0
Mining
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	10	29
91+ Still Accruing	0	0
Power
Financing Receivable, Nonaccrual [Line Items]
Non-accrual	0	2
91+ Still Accruing	$ 0	$ 0