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Investments - Schedule of Available-For-Sale Investments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt securities |  |
Amortized cost | $ 11,486 | $ 10,404
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 11,486 | 10,404
U.S. Treasury bills |  |
Debt securities |  |
Amortized cost | 997 | 0
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 997 | 0
Money market mutual funds |  |
Debt securities |  |
Amortized cost | 10,354 | 10,266
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 10,354 | 10,266
Other short-term interest-bearing securities |  |
Debt securities |  |
Amortized cost | 135 | 138
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | $ 135 | $ 138

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