Financial Instruments - Equity Warrants and Non-Marketable Equity Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Sep. 30, 2023
Derivative [Line Items]
Payments to acquire convertible notes		$ 1,300	$ 2,750	$ 1,250
Amount of additional investment		2,700
Reclassification adjustment for gains (losses) on available-for-sale debt securities	$ 3,263		$ (1)
Fair value of convertible notes and amounts recorded for nonvoting preferred stock investments	13,800
Equity investments without readily determinable fair values	6,100	989
Equity method investments	1,200	1,200
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	$ 1,900	$ 2,700