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AVAILABLE-FOR-SALE DEBT SECURITIES
 9 Months Ended
Sep. 30, 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:
September 30, 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$360 $— $— $360 $308 $1 $— $309 
U.S. government agencies securities5 — — 5 — — — — 
Non-U.S. government securities44 — — 44 43 — — 43 
Certificates of deposit361 — — 361 216 — — 216 
Corporate debt securities1,272 1 (1)1,272 1,140 2 — 1,142 
Residential mortgage and asset-backed securities
447 — — 447 316 — — 316 
Total$2,489 $1 $(1)$2,489 $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)September 30, 2021December 31, 2020
Cash and cash equivalents$14 $113 
Short-term marketable securities1,376 1,411 
Long-term marketable securities1,099 502 
Total$2,489 $2,026 
The following table summarizes our available-for-sale debt securities by contractual maturity:
 September 30, 2021
(in millions)Amortized CostFair Value
Within one year$1,390 $1,390 
After one year through five years1,075 1,075 
After five years24 24 
Total$2,489 $2,489 
We held a total of 214 and 208 positions which were in unrealized loss positions as of September 30, 2021 and 2020, respectively. The unrealized losses were largely due to changes in interest rates. Aggregated gross unrealized losses on available-for-sale debt securities were not material for the three and nine months ended September 30, 2021 and 2020. No impairment was recognized for the three and nine months ended September 30, 2021 and 2020.