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Credit Losses
6 Months Ended
Nov. 30, 2020
Credit Loss [Abstract]  
Credit Losses

(2) Credit Losses

We are exposed to credit losses primarily through our trade receivables. We assess ability to pay for certain customers by conducting a credit review, which considers the customer’s established credit rating and our assessment of creditworthiness. We determine the allowance for credit losses on accounts receivable using a combination of specific reserves for accounts that are deemed to exhibit credit loss indicators and general reserves that are determined using loss rates based on historical write-offs by geography and recent forecast information, including underlying economic expectations. We update our estimate of credit loss reserves quarterly, considering recent write-offs, collections information and underlying economic expectations.

Credit losses were $148 million for the three-month period ended November 30, 2020 and $291 million for the six-month period ended November 30, 2020. Credit losses were $102 million for the three-month period ended November 30, 2019 and $208 million for the six-month period ended November 30, 2019. Our allowance for credit losses was $296 million as of November 30, 2020 and $175 million at May 31, 2020.