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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

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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