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Revenue Recognition
 9 Months Ended
Sep. 30, 2020
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 September 30, Nine Months Ended September 30,
Millions of dollars2020201920202019
Major product categories:
Laundry$1,588 $1,576 $3,989 $4,531 
Refrigeration1,701 1,673 4,368 4,694 
Cooking1,159 1,183 3,011 3,289 
Dishwashing509 414 1,320 1,169 
Total major product category net sales $4,957 $4,846 $12,688 $13,683 
Compressors(1)
— — — 557 
Spare parts and warranties247 227 681 749 
Other87 18 289 48 
Total net sales$5,291 $5,091 $13,658 $15,037 
(1)Change in compressors compared to the prior year is due to the divestiture of the Embraco compressor business.
The impact to revenue related to prior period performance obligations was not material for the three and nine months ended September 30, 2020.
Allowance for Expected Credit Losses and Bad Debt Expense

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 adoption of the new credit loss standard did not have a material impact on the Consolidated Condensed Financial Statements.
The following table summarizes our allowance for doubtful accounts by operating segment for the nine months ended September 30, 2020.
Millions of dollarsDecember 31, 2019Charged to EarningsWrite-offsForeign CurrencySeptember 30, 2020
North America
$4 $5 $— $— $9 
EMEA
83 5 (13)— 75 
Latin America
33 13 (3)(6)37 
Asia
12 11 — — 23 
Consolidated
$132 $34 $(16)$(6)$144 
We also have an allowance on certain financing receivables that are recorded in prepaid and other current assets and other noncurrent assets on our Consolidated Condensed Balance Sheets. The allowance at September 30, 2020 and December 31, 2019 was approximately $45 million and $48 million, respectively. The amount charged to earnings and write-offs for the nine months ended September 30, 2020 were not material.