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Guarantees and Product Warranty (Tables)
3 Months Ended
Mar. 31, 2025
Guarantees and Product Warranties [Abstract]  
Summary of product warranty
The reconciliation of the change in our product warranty liability balances for the three months ended March 31 was as follows:

Three Months Ended March 31,
(Millions of dollars)20252024
Warranty liability, beginning of period$1,700 $1,894 
Reduction in liability (payments)(166)(199)
Increase in liability (new warranties) 103 133 
Warranty liability, end of period$1,637 $1,828