Investments - Schedule of Available-For-Sale Investments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
Amortized cost	$ 9,237	$ 10,404
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	9,237	10,404
Money market mutual funds
Marketable Securities [Line Items]
Amortized cost	9,099	10,266
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	9,099	10,266
Other short-term interest-bearing securities
Marketable Securities [Line Items]
Amortized cost	138	138
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	$ 138	$ 138