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Investments - Schedule of Available-For-Sale Investments (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
Amortized cost	$ 8,812	$ 10,404
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	8,812	10,404
U.S. Treasury bills
Marketable Securities [Line Items]
Amortized cost	995	0
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	995	0
Money market mutual funds
Marketable Securities [Line Items]
Amortized cost	7,678	10,266
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	7,678	10,266
Other short-term interest-bearing securities
Marketable Securities [Line Items]
Amortized cost	139	138
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	$ 139	$ 138

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