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Warranty Reserve
 12 Months Ended
Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]  
Warranty Reserve Warranty Reserve
We provide warranties against defects and product failures on certain of our products, including remanufactured engines and transmissions (warranty periods ranging from 12 to 48 months) and certain salvage mechanical products (warranty period of 6 months or 6,000 miles). We also offer limited lifetime warranties on certain collision sheet metal products.

The changes in the warranty reserve are as follows (in millions):
20242023
Balance as of January 1,$35 $32 
Warranty expense89 86 
Warranty claims(85)(83)
Balance as of December 31,$39 $35