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Investments - Unrealized Gains and Losses and Estimated Fair Value of Investments Classified as Available-for-Sale Debt Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Investments    
Estimated Fair Value $ 2,900  
Short-term investments:    
Investments    
Gross Amortized Cost 954 $ 3,462
Gross Unrealized Gains 2 1
Gross Unrealized Losses (1) (6)
Estimated Fair Value 955 3,457
Short-term investments: | Corporate debt securities    
Investments    
Gross Amortized Cost 924 3,095
Gross Unrealized Gains 2 1
Gross Unrealized Losses 0 (2)
Estimated Fair Value 926 3,094
Short-term investments: | Government and agency securities    
Investments    
Gross Amortized Cost 30 367
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (4)
Estimated Fair Value 29 363
Long-term investments:    
Investments    
Gross Amortized Cost 1,930 1,311
Gross Unrealized Gains 17 4
Gross Unrealized Losses (2) (6)
Estimated Fair Value 1,945 1,309
Long-term investments: | Corporate debt securities    
Investments    
Gross Amortized Cost 1,795 1,117
Gross Unrealized Gains 17 4
Gross Unrealized Losses (1) (2)
Estimated Fair Value 1,811 1,119
Long-term investments: | Government and agency securities    
Investments    
Gross Amortized Cost 135 194
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (4)
Estimated Fair Value $ 134 $ 190