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Investments - Schedule of Available-For-Sale Investments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 8,708	$ 11,486
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	8,708	11,486
U.S. Treasury bills
Debt Securities, Available-for-sale [Line Items]
Amortized cost	998	997
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	998	997
Money market mutual funds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	7,581	10,354
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	7,581	10,354
Other short-term interest-bearing securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	129	135
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	$ 129	$ 135

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