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Cash and Cash Equivalents, Investments and Restricted Cash - Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Market Value of Cash and Cash Equivalents and Available-for-Sale Investments (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Cash and Cash Equivalents, at Carrying Value [Abstract]    
Cash and cash equivalents $ 1,973 $ 2,315
Short-term investments:    
Amortized Cost 1,535  
Estimated Fair Market Value 1,516  
Restricted cash 2 1
Amortized Cost, Total 3,510 2,832
Gross Unrealized Losses, Total (19) (2)
Estimated Fair Market Value, Total 3,491 2,830
U.S. government agency securities    
Short-term investments:    
Amortized Cost 1,371 473
Gross Unrealized Losses (18) (2)
Estimated Fair Market Value 1,353 471
U.S. government agency securities    
Short-term investments:    
Amortized Cost 119 33
Gross Unrealized Losses (1) 0
Estimated Fair Market Value 118 33
Treasury bills    
Short-term investments:    
Amortized Cost 45  
Gross Unrealized Losses 0  
Estimated Fair Market Value 45  
Commercial paper    
Short-term investments:    
Amortized Cost   10
Gross Unrealized Losses   0
Estimated Fair Market Value   10
Cash    
Cash and Cash Equivalents, at Carrying Value [Abstract]    
Cash and cash equivalents 153 183
Money market funds    
Cash and Cash Equivalents, at Carrying Value [Abstract]    
Cash and cash equivalents $ 1,820 $ 2,132