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Cash and Cash Equivalents, Investments and Restricted Cash
 3 Months Ended
Mar. 31, 2023
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents, Investments and Restricted Cash Cash and Cash Equivalents, Investments and Restricted Cash
The following table presents the amortized cost and estimated fair market value of our cash and cash equivalents, investments, and restricted cash as of the dates presented (in millions):
 March 31, 2023December 31, 2022
 Amortized
Cost		Estimated
Fair Market
Value		Amortized
Cost		Estimated
Fair Market
Value
Cash$85 $85 $128 $128 
Cash equivalents:
Money market funds1,309 1,309 1,338 1,338 
Short-term investments:
U. S. government treasury securities (1)1,765 1,762 1,731 1,716 
Corporate bonds203 203 162 161 
Commercial paper10 10 10 10 
U.S. government agency securities— — 9 9 
Restricted cash2 2 2 2 
        Total$3,374 $3,371 $3,380 $3,364 
(1) The estimated fair market value includes $4 million of gross unrealized gains and $7 million of gross unrealized losses as of March 31, 2023 and $15 million of gross unrealized losses as of December 31, 2022.
The following table presents available-for-sale investments by contractual maturity date as of March 31, 2023 (in millions):
Amortized CostEstimated Fair
Market Value
Due in one year or less$883 $878 
Due after one year 1,095 1,097 
Total $1,978 $1,975