Investments - Summary of Investments (Detail) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 4,213	$ 6,303
Gross Unrealized Gains	7	40
Gross Unrealized Losses	(16)	(14)
Estimated Fair Value	4,204	6,329
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6	173
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	6	173
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,295	4,759
Gross Unrealized Gains	7	34
Gross Unrealized Losses	(1)	0
Estimated Fair Value	3,301	4,793
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8	11
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	8	11
U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	799	1,257
Gross Unrealized Gains	0	6
Gross Unrealized Losses	(1)	0
Estimated Fair Value	798	1,263
Mortgage-backed and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	105	103
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(14)	(14)
Estimated Fair Value	$ 91	$ 89

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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