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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
Dec. 31, 2025
Dec. 31, 2024
Investments    
Amortized Cost    
One year or less $ 2,201 $ 2,383
One year through five years 7,266 7,799
Five years through ten years 4,198 4,343
Greater than ten years 160 165
Asset-backed securities 4,575 4,925
Amortized Cost 18,400 19,615
Fair Value    
One year or less 2,190 2,365
One year through five years 7,219 7,563
Five years through ten years 4,252 4,172
Greater than ten years 157 160
Asset-backed securities 4,516 4,730
Fair Value 18,334 18,990
Restricted Deposits    
Amortized Cost    
One year or less 464 477
One year through five years 574 610
Five years through ten years 334 301
Greater than ten years 43 31
Asset-backed securities 0 0
Amortized Cost 1,415 1,419
Fair Value    
One year or less 464 475
One year through five years 566 593
Five years through ten years 339 291
Greater than ten years 43 31
Asset-backed securities 0 0
Fair Value $ 1,412 $ 1,390