Investments and Fair Value Measurements - Additional Information (Detail) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026 USD ($) security	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) security	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) security
Fair Value Disclosures [Abstract]
Proceeds from sale of available-for-sale securities	$ 0	$ 0	$ 0	$ 280
Available-for-sale debt securities in unrealized loss position	$ 5,800		$ 5,800		$ 700
Number of securities in an unrealized loss position for greater than 12 months \| security	0		0		0
Credit or non-credit losses related to debt securities	$ 0	$ 0	$ 0	$ 0
Unrealized gain (loss) from equity securities	66		64
Privately-held equity securities without readily determinable fair value, amount	$ 167		$ 167		$ 170

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

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