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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 | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Unrealized Losses |  |
Less Than 12 Months | $ (33) | $ (5)
12 Months or More | (332) | (320)
Fair Value |  |
Fair Value, Less Than 12 Months | 3,724 | 1,183
Fair Value, 12 Months or More | 5,626 | 6,166
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Unrealized Losses |  |
Less Than 12 Months | (1) | 0
12 Months or More | 0 | (1)
Fair Value |  |
Fair Value, Less Than 12 Months | 203 | 88
Fair Value, 12 Months or More | 28 | 43
Corporate securities |  |
Unrealized Losses |  |
Less Than 12 Months | (20) | (2)
12 Months or More | (153) | (144)
Fair Value |  |
Fair Value, Less Than 12 Months | 2,130 | 464
Fair Value, 12 Months or More | 2,933 | 3,226
Municipal securities |  |
Unrealized Losses |  |
Less Than 12 Months | (4) | (1)
12 Months or More | (68) | (68)
Fair Value |  |
Fair Value, Less Than 12 Months | 582 | 241
Fair Value, 12 Months or More | 1,431 | 1,550
Asset-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | (3) | (2)
12 Months or More | (10) | (8)
Fair Value |  |
Fair Value, Less Than 12 Months | 307 | 114
Fair Value, 12 Months or More | 159 | 180
Residential mortgage-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | (3) | 0
12 Months or More | (72) | (70)
Fair Value |  |
Fair Value, Less Than 12 Months | 267 | 120
Fair Value, 12 Months or More | 618 | 687
Commercial mortgage-backed securities |  |
Unrealized Losses |  |
Less Than 12 Months | (2) | 0
12 Months or More | (29) | (29)
Fair Value |  |
Fair Value, Less Than 12 Months | 235 | 156
Fair Value, 12 Months or More | $ 457 | $ 480

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