Financial Instruments - Available-for-sale Marketable Securities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Marketable Securities [Line Items]
Less than 12 months, fair value	$ 2,721	$ 10,284
Less than 12 months, unrealized losses	(3)	(99)
12 months or greater, fair value	3,129	12,786
12 months or greater, unrealized losses	(38)	(382)
Fair value	5,850	23,070
Unrealized losses	(41)	(481)
U.S. government securities
Marketable Securities [Line Items]
Less than 12 months, fair value	1,491	6,860
Less than 12 months, unrealized losses	(2)	(71)
12 months or greater, fair value	1,570	4,330
12 months or greater, unrealized losses	(18)	(146)
Fair value	3,061	11,190
Unrealized losses	(20)	(217)
U.S. government agency securities
Marketable Securities [Line Items]
Less than 12 months, fair value	17	435
Less than 12 months, unrealized losses	0	(2)
12 months or greater, fair value	25	2,083
12 months or greater, unrealized losses	0	(44)
Fair value	42	2,518
Unrealized losses	0	(46)
Corporate debt securities
Marketable Securities [Line Items]
Less than 12 months, fair value	1,213	2,989
Less than 12 months, unrealized losses	(1)	(26)
12 months or greater, fair value	1,534	6,373
12 months or greater, unrealized losses	(20)	(192)
Fair value	2,747	9,362
Unrealized losses	$ (21)	$ (218)

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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