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Other Accrued Liabilities
 12 Months Ended
Dec. 31, 2020
Other Liabilities Disclosure [Abstract]  
Other Accrued Liabilities Other Accrued Liabilities
Other accrued liabilities included the following at December 31, (in millions):
20202019
Customer accruals$683 $605 
Operating lease liabilities129 132 
Accrued self-insurance liabilities, contingencies and warranty113 124 
Accrued income taxes66 114 
Accrued interest expense60 63 
Accruals for manufacturing, marketing and freight expenses57 50 
Other285 252 
$1,393 $1,340 

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.