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Investments - Schedule of Available-For-Sale Investments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt securities |  |
Amortized cost | $ 10,404 | $ 4,335
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 10,404 | 4,335
U.S. Treasury bills |  |
Debt securities |  |
Amortized cost | 0 | 1,676
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 0 | 1,676
Money market mutual funds |  |
Debt securities |  |
Amortized cost | 10,266 | 2,659
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 10,266 | 2,659
Other short-term interest-bearing securities |  |
Debt securities |  |
Amortized cost | 138 | 0
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | $ 138 | $ 0

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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