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Investments - Schedule of Available-For-Sale Investments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 8,302 | $ 11,486
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 8,302 | 11,486
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 997 | 997
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 997 | 997
Money market mutual funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 7,182 | 10,354
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 7,182 | 10,354
Other short-term interest-bearing securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 123 | 135
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | $ 123 | $ 135

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