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Investments (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 12,275	$ 9,844
Gross unrealized gains	0	1
Gross unrealized losses	0	0
Fair values	12,275	9,845
U.S. Treasury notes [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	51	129
Gross unrealized gains	0	1
Gross unrealized losses	0	0
Fair values	51	130
U.S. Treasury bills [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	3,900	4,948
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	3,900	4,948
Money market mutual funds [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	8,323	4,765
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	8,323	4,765
Other short-term interest-bearing securities [Member]
Debt Securities, Available-for-sale [Line Items]
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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