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Other Accrued Liabilities
12 Months Ended
Dec. 31, 2021
Accrued Liabilities, Current [Abstract]  
Other Accrued Liabilities Other Accrued Liabilities
Other accrued liabilities included the following at December 31, (in millions):
20212020
Customer accruals$715 $683 
Accrued self-insurance liabilities, contingencies and warranty125 108 
Operating lease liabilities122 129 
Accrued marketing and freight expenses59 57 
Accrued interest expense56 60 
Accrued income taxes43 66 
Other244 290 
$1,364 $1,393 

Customer accruals are promotional allowances and rebates, including cooperative advertising, given to customers in exchange for their selling efforts and volume purchased, as well as allowances for returns. Payments for annual rebates and other customer programs are generally made in the first quarter of the year. Self-insurance liabilities relate to casualty liabilities such as workers’ compensation, general and product liability and auto liability and are estimated based upon historical loss experience combined with actuarial evaluation methods, review of significant individual files and the application of risk transfer programs.