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Cash and Cash Equivalents, Investments and Restricted Cash (Tables)
 9 Months Ended
Sep. 30, 2023
Cash and Cash Equivalents [Abstract]  
Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Market Value of Cash and Cash Equivalents and Available-for-Sale Investments
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):
 September 30, 2023December 31, 2022
 Amortized
Cost		Estimated
Fair Market
Value		Amortized
Cost		Estimated
Fair Market
Value
Cash$110 $110 $128 $128 
Cash equivalents:
Money market funds1,736 1,736 1,338 1,338 
Short-term investments:
U.S. government treasury securities(1)
1,278 1,258 1,731 1,716 
Corporate bonds136 135 162 161 
Commercial paper14 14 10 10 
U.S. government agency securities14 14 9 9 
Restricted cash3 3 2 2 
        Total$3,291 $3,270 $3,380 $3,364 
(1)The estimated fair market value includes $20 million and $15 million of gross unrealized losses as of September 30, 2023 and December 31, 2022, respectively.
Debt Securities, Available-for-sale The following table presents available-for-sale investments by contractual maturity date as of September 30, 2023 (in millions):
Amortized CostEstimated Fair
Market Value
Due in one year or less$513 $509 
Due after one year 929 912 
Total $1,442 $1,421