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Available-for-Sale Debt Securities (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Securities, Available-for-sale [Abstract]  
Summary of Available-for-Sale Debt Securities at Estimated Fair Value
The following table summarizes our available-for-sale debt securities:
December 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$408 $— $(1)$407 $308 $1 $— $309 
U.S. government agencies securities4 — — 4 — — — — 
Non-U.S. government securities50 — — 50 43 — — 43 
Certificates of deposit249 — — 249 216 — — 216 
Corporate debt securities1,365 — (2)1,363 1,140 2 — 1,142 
Residential mortgage and asset-backed securities425 — (1)424 316 — — 316 
Total$2,501 $— $(4)$2,497 $2,023 $3 $— $2,026 
Summary of the Classification of Available-for-Sale Debt Securities
The following table summarizes the classification of our available-for-sale debt securities in our Consolidated Balance Sheets:
(in millions)December 31, 2021December 31, 2020
Cash and cash equivalents$6 $113 
Short-term marketable debt securities1,182 1,411 
Long-term marketable debt securities1,309 502 
Total$2,497 $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:
December 31, 2021
(in millions)Amortized CostFair Value
Within one year$1,189 $1,188 
After one year through five years1,288 1,286 
After five years24 23 
Total$2,501 $2,497