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AVAILABLE-FOR-SALE DEBT SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Securities, Available-for-sale [Abstract]  
Reconciliation of Available-for-Sale Debt Securities from Cost Basis to Fair Value
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 
Summary of Classification of Available-for-Sale Debt Securities
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 
Summary of Available-for-Sale Debt Securities by Contractual Maturity
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