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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
Mar. 31, 2025
Dec. 31, 2024
Investments    
Estimated Fair Value $ 3,248  
Short-term investments 30  
Short-term investments:    
Investments    
Gross Amortized Cost 1,793 $ 3,462
Gross Unrealized Gains 0 1
Gross Unrealized Losses (3) (6)
Estimated Fair Value 1,790 3,457
Short-term investments: | Corporate debt securities    
Investments    
Gross Amortized Cost 1,540 3,095
Gross Unrealized Gains 0 1
Gross Unrealized Losses (1) (2)
Estimated Fair Value 1,539 3,094
Short-term investments: | Government and agency securities    
Investments    
Gross Amortized Cost 253 367
Gross Unrealized Gains 0 0
Gross Unrealized Losses (2) (4)
Estimated Fair Value 251 363
Long-term investments:    
Investments    
Gross Amortized Cost 1,454 1,311
Gross Unrealized Gains 8 4
Gross Unrealized Losses (4) (6)
Estimated Fair Value 1,458 1,309
Long-term investments: | Corporate debt securities    
Investments    
Gross Amortized Cost 1,310 1,117
Gross Unrealized Gains 8 4
Gross Unrealized Losses (1) (2)
Estimated Fair Value 1,317 1,119
Long-term investments: | Government and agency securities    
Investments    
Gross Amortized Cost 144 194
Gross Unrealized Gains 0 0
Gross Unrealized Losses (3) (4)
Estimated Fair Value $ 141 $ 190