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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

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