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Investments - Unrealized Gains and Losses and Estimated Fair Value of Investments Classified as Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Investments |  |
Estimated Fair Value | $ 3,248 |
Short-term investments | 30 |
Short-term investments: |  |
Investments |  |
Gross Amortized Cost | 1,793 | $ 3,462
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (3) | (6)
Estimated Fair Value | 1,790 | 3,457
Short-term investments: | Corporate debt securities |  |
Investments |  |
Gross Amortized Cost | 1,540 | 3,095
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (1) | (2)
Estimated Fair Value | 1,539 | 3,094
Short-term investments: | Government and agency securities |  |
Investments |  |
Gross Amortized Cost | 253 | 367
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2) | (4)
Estimated Fair Value | 251 | 363
Long-term investments: |  |
Investments |  |
Gross Amortized Cost | 1,454 | 1,311
Gross Unrealized Gains | 8 | 4
Gross Unrealized Losses | (4) | (6)
Estimated Fair Value | 1,458 | 1,309
Long-term investments: | Corporate debt securities |  |
Investments |  |
Gross Amortized Cost | 1,310 | 1,117
Gross Unrealized Gains | 8 | 4
Gross Unrealized Losses | (1) | (2)
Estimated Fair Value | 1,317 | 1,119
Long-term investments: | Government and agency securities |  |
Investments |  |
Gross Amortized Cost | 144 | 194
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3) | (4)
Estimated Fair Value | $ 141 | $ 190

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