Financial Instruments - Non-Marketable Equity Investments (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		18 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Derivative [Line Items]
Payments to acquire convertible notes		$ 1,300					$ 5,300
Fair value of convertible notes	$ 23,700				$ 23,700
Reclassification adjustments for gains (losses) on available-for-sale debt securities	2,307		$ 3,300	$ 0	5,592	$ (5)
Amount of additional investment		$ 1,400
Equity investments without readily determinable fair values	16,000				16,000		989
Reclassification adjustments for gains (losses) on available-for-sale debt securities					18,800
Equity method investments	1,100				1,100		1,200
Preferred Stock
Derivative [Line Items]
Equity investments without readily determinable fair values	14,800				14,800
Fair Value, Inputs, Level 3
Derivative [Line Items]
Fair value of convertible notes							13,800
Warrant | Level 2 assets
Derivative [Line Items]
Fair value of warrant assets	$ 2,900				$ 2,900		$ 2,700