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Investments - Amortized Cost Versus Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost $ 719 $ 1,280
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Total 719 1,280
Cash equivalents    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 710 1,231
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Total 710 1,231
Cash equivalents | Money market funds    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 597 1,002
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Total 597 1,002
Cash equivalents | U.S. government and government agency debt securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 113 229
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Total 113 229
Short-term marketable securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 9 49
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Total 9 49
Short-term marketable securities | U.S. government and government agency debt securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 9 47
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Total $ 9 47
Short-term marketable securities | Corporate debt securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost   2
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Total   $ 2