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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

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