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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

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- 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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