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Short-term and Long-term Investments, Restricted Deposits - Schedule of Contractual Maturities of Short-Term and Long-Term Investments and Restricted Deposits (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Investments    
Amortized Cost    
One year or less $ 2,231 $ 2,201
One year through five years 7,211 7,266
Five years through ten years 4,058 4,198
Greater than ten years 159 160
Asset-backed securities 4,516 4,575
Amortized Cost 18,175 18,400
Fair Value    
One year or less 2,217 2,190
One year through five years 7,109 7,219
Five years through ten years 4,057 4,252
Greater than ten years 156 157
Asset-backed securities 4,430 4,516
Fair Value 17,969 18,334
Restricted Deposits    
Amortized Cost    
One year or less 466 464
One year through five years 611 574
Five years through ten years 348 334
Greater than ten years 18 43
Asset-backed securities 0 0
Amortized Cost 1,443 1,415
Fair Value    
One year or less 465 464
One year through five years 600 566
Five years through ten years 349 339
Greater than ten years 18 43
Asset-backed securities 0 0
Fair Value $ 1,432 $ 1,412