Financial Instruments - Available-for-sale Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
Less than 12 months, fair value	$ 4,427	$ 1,054
Less than 12 months, unrealized losses	(16)	(4)
12 months or greater, fair value	18,235	20,391
12 months or greater, unrealized losses	(874)	(930)
Fair value	22,662	21,445
Unrealized losses	(890)	(934)
U.S. government securities
Marketable Securities [Line Items]
Less than 12 months, fair value	3,098	336
Less than 12 months, unrealized losses	(11)	(1)
12 months or greater, fair value	5,825	7,041
12 months or greater, unrealized losses	(278)	(275)
Fair value	8,923	7,377
Unrealized losses	(289)	(276)
U.S. government and agency securities
Marketable Securities [Line Items]
Less than 12 months, fair value	447	71
Less than 12 months, unrealized losses	(1)	0
12 months or greater, fair value	3,108	3,225
12 months or greater, unrealized losses	(146)	(164)
Fair value	3,555	3,296
Unrealized losses	(147)	(164)
Corporate debt securities
Marketable Securities [Line Items]
Less than 12 months, fair value	882	647
Less than 12 months, unrealized losses	(4)	(3)
12 months or greater, fair value	9,302	10,125
12 months or greater, unrealized losses	(450)	(491)
Fair value	10,184	10,772
Unrealized losses	$ (454)	$ (494)

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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