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Investments - Schedule (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt securities |  |
Amortized cost | $ 4,335 | $ 7,304
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 4,335 | 7,304
U.S. Treasury notes |  |
Debt securities |  |
Amortized cost | 0 | 47
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 0 | 47
U.S. Treasury bills |  |
Debt securities |  |
Amortized cost | 1,676 | 1,400
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 1,676 | 1,400
Money market mutual funds |  |
Debt securities |  |
Amortized cost | 2,659 | 5,856
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 2,659 | 5,856
Other short-term interest-bearing securities |  |
Debt securities |  |
Amortized cost | 0 | 1
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | $ 0 | $ 1

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