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Cash, Cash Equivalents and Restricted Cash, Investments and Fair Value Measurements
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Cash, Cash Equivalents and Restricted Cash, Investments and Fair Value Measurements
3. Cash, Cash Equivalents and Restricted Cash, Investments and Fair Value Measurements
Investments
As of March 31, 2024 and December 31, 2023, Wayfair’s marketable securities, which primarily consisted of corporate bonds and other government obligations that are priced at fair value, were classified as available-for-sale investments. During the three months ended March 31, 2024 and 2023, Wayfair did not have any realized gains or losses. During the three months ended March 31, 2024 and 2023, Wayfair recorded interest income, including interest earned from cash and cash equivalents and marketable securities, of $12 million and $7 million, respectively.
During the three months ended March 31, 2024 and 2023, Wayfair did not recognize any credit losses related to its available-for-sale debt securities. As of March 31, 2024 and December 31, 2023, Wayfair did not have an allowance for credit losses recorded related to its available-for-sale debt securities.
The following table presents details of Wayfair’s investment securities as of March 31, 2024 and December 31, 2023:
 March 31, 2024
 Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair Value
(in millions)
Short-term:    
Investment securities$20 $— $— $20 
Total$20 $— $— $20 
 December 31, 2023
 Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair Value
(in millions)
Short-term:    
Investment securities$29 $— $— $29 
Total$29 $— $— $29 
Fair Value Measurements
Wayfair's financial assets and liabilities are measured at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The three levels of inputs used to measure fair value are as follows:
Level 1—Unadjusted quoted prices in active markets for identical assets or liabilities
Level 2—Unadjusted quoted prices in active markets for similar assets or liabilities, unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs other than quoted prices that are observable or can be corroborated by observable market data for substantially the full-term of the asset or liability
Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the asset or liability
This hierarchy requires Wayfair to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. Wayfair classifies cash equivalents and certificate of deposits within Level 1 because these are valued using quoted market prices. The fair value of Level 1 financial assets is based on quoted market prices of the identical underlying security. Wayfair classifies short-term investments within Level 2 because unadjusted quoted prices for identical or similar assets in markets are not active. Wayfair does not have assets that are classified as Level 3.
The following tables set forth the fair value of Wayfair's financial assets measured at fair value on a recurring basis as of March 31, 2024 and December 31, 2023:
 March 31, 2024
 Level 1Level 2Level 3Total
(in millions)
Cash and cash equivalents:   
Cash$468 $— $— $468 
Cash equivalents639 — — 639 
Total cash and cash equivalents 1,107 — — 1,107 
Short-term investments:   
Investment securities— 20 — 20 
Certificate of deposit30 — — 30 
Total short-term investments30 20— 50
Prepaid expenses and other current assets:
Certificate of deposit (1)
— — 
Total$1,141 $20 $— $1,161 
 December 31, 2023
 Level 1Level 2Level 3Total
(in millions)
Cash and cash equivalents:   
Cash$407 $— $— $407 
Cash equivalents915 — — 915 
Total cash and cash equivalents1,322 — — 1,322 
Short-term investments:
Investment securities— 29 — 29 
Prepaid expenses and other current assets:
Certificate of deposit (1)
— — 
Total$1,326 $29 $— $1,355 
(1) The certificate of deposit is classified as restricted cash that is primarily restricted to funds held in collateral.