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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 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 period114 47 
Settlements made during the period/other(86)(124)
Balance at March 31
$301 $306 
Current portion$207 $179 
Non-current portion94 127 
Total$301 $306