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Investments (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 7,158,000,000	$ 9,844,000,000
Gross unrealized gains	1,000,000	1,000,000
Gross unrealized losses	0	0
Fair values	7,159,000,000	9,845,000,000
U.S. Treasury notes [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	51,000,000	129,000,000
Gross unrealized gains	1,000,000	1,000,000
Gross unrealized losses	0	0
Fair values	52,000,000	130,000,000
U.S. Treasury bills [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,400,000,000	4,948,000,000
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	1,400,000,000	4,948,000,000
Money market mutual funds [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	5,707,000,000	4,765,000,000
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	5,707,000,000	4,765,000,000
Other short-term interest-bearing securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	0	2,000,000
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	$ 0	$ 2,000,000

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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