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Investments - Schedule (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt securities |  |
Amortized cost | $ 7,304 | $ 9,844
Gross unrealized gains | 0 | 1
Gross unrealized losses | 0 | 0
Fair values | 7,304 | 9,845
U.S. Treasury notes [Member] |  |
Debt securities |  |
Amortized cost | 47 | 129
Gross unrealized gains | 0 | 1
Gross unrealized losses | 0 | 0
Fair values | 47 | 130
U.S. Treasury bills [Member] |  |
Debt securities |  |
Amortized cost | 1,400 | 4,948
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 1,400 | 4,948
Money market mutual funds [Member] |  |
Debt securities |  |
Amortized cost | 5,856 | 4,765
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 5,856 | 4,765
Other short-term interest-bearing securities [Member] |  |
Debt securities |  |
Amortized cost | 1 | 2
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | $ 1 | $ 2

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