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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, 2024
Dec. 31, 2023
Investments    
Amortized Cost    
One year or less $ 2,383 $ 2,308
One year through five years 7,799 7,738
Five years through ten years 4,343 3,905
Greater than ten years 165 155
Asset-backed securities 4,925 4,317
Amortized Cost 19,615 18,423
Fair Value    
One year or less 2,365 2,284
One year through five years 7,563 7,431
Five years through ten years 4,172 3,735
Greater than ten years 160 154
Asset-backed securities 4,730 4,117
Fair Value 18,990 17,721
Restricted Deposits    
Amortized Cost    
One year or less 477 566
One year through five years 610 527
Five years through ten years 301 298
Greater than ten years 31 34
Asset-backed securities 0 0
Amortized Cost 1,419 1,425
Fair Value    
One year or less 475 564
One year through five years 593 504
Five years through ten years 291 283
Greater than ten years 31 35
Asset-backed securities 0 0
Fair Value $ 1,390 $ 1,386