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Revenue Recognition
3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Recognition REVENUE RECOGNITION
Disaggregation of Revenue
The following table presents our disaggregated revenues by revenue source. We sell products within all product categories in each operating segment. For additional information on the disaggregated revenues by geographic regions, see Note 14 to the Consolidated Condensed Financial Statements.
Three Months Ended March 31,
Millions of dollars20212020
Major product categories:
Laundry$1,569 $1,330 
Refrigeration1,627 1,362 
Cooking1,247 943 
Dishwashing515 371 
Total major product category net sales $4,958 $4,006 
Spare parts and warranties266 228 
Other134 90 
Total net sales$5,358 $4,325 
The impact to revenue related to prior period performance obligations is less than 1% of global consolidated revenues for the three months ended March 31, 2021.

Allowance for Expected Credit Losses

We estimate our expected credit losses primarily by using an aging methodology and establish customer-specific reserves for higher risk trade customers. Our expected credit losses are evaluated and controlled within each geographic region considering the unique credit risk specific to the country, marketplace and economic environment. We take into account past events, current conditions and reasonable and supportable forecasts in developing the reserve.

The following table summarizes our allowance for expected credit losses by operating segment for the three months ended March 31, 2021.
Millions of dollarsDecember 31, 2020Charged to EarningsWrite-offsForeign Currency
Other (1)
March 31, 2021
Accounts receivable allowance
North America$$2 $(3)$ $ $6 
EMEA67 1 (13)(1) 54 
Latin America44 (1)1 (3) 41 
Asia14   (1)(11)2 
Consolidated$132 $2 $(15)$(5)$(11)$103 
Financing receivable allowance
Latin America$27 $ $ $ $ $27 
Asia21    (21) 
$48 $ $ $ $(21)$27 
Consolidated$180 $2 $(15)$(5)$(32)$130 
(1)Accounts receivable and financing receivable allowance of Whirlpool China which were previously classified under accounts receivable and noncurrent assets, respectively, have been transferred to assets held for sale. For additional information, see Note 15 to the Consolidated Condensed Financial Statements.