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AVAILABLE-FOR-SALE DEBT SECURITIES
 3 Months Ended
Mar. 31, 2021
Debt Securities, Available-for-sale [Abstract]  
AVAILABLE-FOR-SALE DEBT SECURITIES AVAILABLE-FOR-SALE DEBT SECURITIES
The following table summarizes our available-for-sale debt securities:
March 31, 2021December 31, 2020
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value 		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair Value 
U.S. treasury securities$464 $— $— $464 $308 $1 $— $309 
Certificates of deposit358 — — 358 216 — — 216 
Non-U.S. government securities62 — — 62 43 — — 43 
Corporate debt securities1,247 1 (1)1,247 1,140 2 — 1,142 
Residential mortgage and asset-backed securities
347 — — 347 316 — — 316 
Total$2,478 $1 $(1)$2,478 $2,023 $3 $— $2,026 
The following table summarizes the classification of our available-for-sale debt securities in our Condensed Consolidated Balance Sheets:
(in millions)March 31, 2021December 31, 2020
Cash and cash equivalents$298 $113 
Short-term marketable securities1,601 1,411 
Long-term marketable securities579 502 
Total$2,478 $2,026 
Accrued interest receivable excluded from both the fair value and amortized cost basis of the available-for-sale debt securities was $9 million as of March 31, 2021 and December 31, 2020 and is recorded in Prepaid and other current assets on our Condensed Consolidated Balance Sheets. There were no write-offs of accrued interest receivable during the three months ended March 31, 2021 and 2020.
The following table summarizes our available-for-sale debt securities by contractual maturity:
 March 31, 2021
(in millions)Amortized CostFair Value
Within one year$1,898 $1,899 
After one year through five years563 562 
After five years17 17 
Total$2,478 $2,478 
We held a total of 203 positions which were in an unrealized loss position as of March 31, 2021. The unrealized losses are largely due to changes in interest rates. Aggregated gross unrealized losses on available-for-sale debt securities were not material, and accordingly, no impairment was recognized for the three months ended March 31, 2021. Gross realized gains and gross realized losses on available-for-sale debt securities were not material for the three months ended March 31, 2021.