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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Product Warranty Reserves The following table summarizes the changes in total product warranty liability reserves for the periods presented:
Product Warranty
Millions of dollars20212020
Balance at January 1$273 $383 
Issuances/accruals during the period258 178 
Settlements made during the period/other(220)(272)
Balance at September 30
$311 $289 
Current portion$211 $186 
Non-current portion100 104 
Total$311 $289