Investments and Fair Value Measurement - Summary of Amortized Cost, Unrealized Gains and Losses and Fair Value of Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 10,624	$ 8,558
Unrealized Gains	10	8
Unrealized Losses	0	(4)
Fair Value	10,634	8,562
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,089	5,843
Unrealized Gains	6	7
Unrealized Losses	0	(2)
Fair Value	7,095	5,848
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,409	702
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	1,409	702
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,063	1,975
Unrealized Gains	4	1
Unrealized Losses	0	(2)
Fair Value	2,067	1,974
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13	0
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	13	0
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	50	38
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	$ 50	$ 38

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).

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