Investments and Fair Value Measurement - Schedule of Amortized Cost, Unrealized Gains and Losses and Fair Value of Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 9,840	$ 10,314
Unrealized Gains	3	12
Unrealized Losses	(6)	0
Fair Value	9,837	10,326
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,346	7,315
Unrealized Gains	2	8
Unrealized Losses	(4)	0
Fair Value	7,344	7,323
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	217	715
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	217	715
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,118	2,190
Unrealized Gains	1	4
Unrealized Losses	(2)	0
Fair Value	2,117	2,194
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	124	72
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	124	72
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	35	22
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	$ 35	$ 22

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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