Financial Instruments - Available-for-sale Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Marketable Securities [Line Items]
Less than 12 months, fair value	$ 21,827	$ 2,721
Less than 12 months, unrealized losses	(65)	(3)
12 months or greater, fair value	1,734	3,129
12 months or greater, unrealized losses	(21)	(38)
Fair value	23,561	5,850
Unrealized losses	(86)	(41)
U.S. government securities
Marketable Securities [Line Items]
Less than 12 months, fair value	13,872	1,491
Less than 12 months, unrealized losses	(39)	(2)
12 months or greater, fair value	769	1,570
12 months or greater, unrealized losses	(9)	(18)
Fair value	14,641	3,061
Unrealized losses	(48)	(20)
U.S. government agency securities
Marketable Securities [Line Items]
Less than 12 months, fair value	199	17
Less than 12 months, unrealized losses	(1)	0
12 months or greater, fair value	25	25
12 months or greater, unrealized losses	0	0
Fair value	224	42
Unrealized losses	(1)	0
Corporate debt securities
Marketable Securities [Line Items]
Less than 12 months, fair value	7,756	1,213
Less than 12 months, unrealized losses	(25)	(1)
12 months or greater, fair value	940	1,534
12 months or greater, unrealized losses	(12)	(20)
Fair value	8,696	2,747
Unrealized losses	$ (37)	$ (21)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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