Accounting Policies and Supplemental Disclosures - Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accounting Policies [Abstract]
Marketable equity securities valuation gains (losses)	$ 220		$ (117)	$ 470	$ (1,800)
Equity warrant valuation gains (losses)	441		80	653	(421)
Reclassification adjustments for gains (losses) on available-for-sale debt securities	2,307	$ 3,300	0	5,592	(5)
Upward adjustments relating to equity investments in private companies	7,226		2	7,312	13
Foreign currency gains (losses)	1		17	69	(195)
Other, net	(9)		(9)	(44)	(310)
Other income (expense), net	$ 10,186		$ (27)	$ 14,052	$ (2,718)