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Short-term and Long-term Investments, Restricted Deposits - Schedule of Fair Value of Available-For-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Unrealized Losses |  |
Less Than 12 Months | $ (5) | $ (84)
12 Months or More | (320) | (643)
Fair Value |  |
Fair Value, Less Than 12 Months | 1,183 | 5,195
Fair Value, 12 Months or More | 6,166 | 8,734
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Unrealized Losses |  |
Less Than 12 Months | 0 | (1)
12 Months or More | (1) | (3)
Fair Value |  |
Fair Value, Less Than 12 Months | 88 | 60
Fair Value, 12 Months or More | 43 | 144
Corporate securities |  |
Unrealized Losses |  |
Less Than 12 Months | (2) | (41)
12 Months or More | (144) | (319)
Fair Value |  |
Fair Value, Less Than 12 Months | 464 | 2,621
Fair Value, 12 Months or More | 3,226 | 4,782
Municipal securities |  |
Unrealized Losses |  |
Less Than 12 Months | (1) | (16)
12 Months or More | (68) | (135)
Fair Value |  |
Fair Value, Less Than 12 Months | 241 | 1,217
Fair Value, 12 Months or More | 1,550 | 2,073
Asset-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | (2) | (4)
12 Months or More | (8) | (17)
Fair Value |  |
Fair Value, Less Than 12 Months | 114 | 301
Fair Value, 12 Months or More | 180 | 331
Residential mortgage-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | 0 | (18)
12 Months or More | (70) | (111)
Fair Value |  |
Fair Value, Less Than 12 Months | 120 | 786
Fair Value, 12 Months or More | 687 | 738
Commercial mortgage-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | 0 | (4)
12 Months or More | (29) | (58)
Fair Value |  |
Fair Value, Less Than 12 Months | 156 | 210
Fair Value, 12 Months or More | $ 480 | $ 666

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