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REVENUE RECOGNITION
 6 Months Ended
Jun. 30, 2022
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 June 30,
Six Months Ended June 30,
Millions of dollars2022202120222021
Major product categories:
Laundry$1,287 $1,380 $2,620 $2,949 
Refrigeration1,733 1,627 3,261 3,254 
Cooking1,247 1,502 2,528 2,749 
Dishwashing465 409 915 924 
Total major product category net sales $4,732 $4,918 $9,324 $9,876 
Spare parts and warranties236 292 470 558 
Other129 114 223 248 
Total net sales$5,097 $5,324 $10,017 $10,682 
The impact to revenue related to prior period performance obligations is less than 1% of global consolidated revenues for the three and six months ended June 30, 2022.

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 following table summarizes our allowance for expected credit losses and bad debt by operating segment for the six months ended June 30, 2022:
Millions of dollarsDecember 31, 2021Charged to EarningsWrite-offsForeign Currency
Other (1)
June 30, 2022
Accounts receivable allowance
North America$7 $— $— $— $— $7 
EMEA45 4 1 (1)(15)34 
Latin America43 1 (1)— — 43 
Asia3 — — — — 3 
Consolidated$98 $5 $— $(1)$(15)$87 
Financing receivable allowance
Latin America$25 $— $— $5 $— $30 
$25 $— $— $5 $— $30 
Consolidated$123 $5 $— $4 $(15)$117 
(1) Accounts receivable allowance of our Russian operations which were previously classified under accounts receivable has been transferred to assets held for sale. For additional information, see Note 15 to the Consolidated Condensed Financial Statements.
We recorded an immaterial amount of bad debt expense for the periods ended June 30, 2022 and December 31, 2021, respectively.