Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Equity Securities, FV-NI, Gain (Loss)
Equity securities, unrealized gain (loss)	$ 443	$ 284	$ (1,700)	$ (195)
Recurring
Schedule of Investments [Line Items]
Cash	10,194		10,194		$ 11,706
Debt Securities, Available-for-sale
Gross unrealized gains	1		1
Gross unrealized losses	(226)		(226)
Cash, Cash Equivalents, and Marketable Securities
Cash, cash equivalents and marketable securities	89,587		89,587		87,283
Cash, cash equivalents and marketable securities, amortized cost	86,795		86,795
Less: Restricted cash, cash equivalents, and marketable securities	(495)		(495)		(503)
Total cash, cash equivalents, and marketable securities	89,092		89,092		86,780
Recurring | Level 1 securities
Schedule of Investments [Line Items]
Equity securities	3,017		3,017		4,658
Recurring | Level 1 securities | Money market funds
Schedule of Investments [Line Items]
Money market funds	21,631		21,631		39,160
Recurring | Level 1 securities | Money market funds | Money market funds
Schedule of Investments [Line Items]
Money market funds	21,631		21,631
Recurring | Level 2 securities | Foreign government and agency securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	19		19
Gross unrealized gains	0		0
Gross unrealized losses	0		0
Fixed income securities	19		19		505
Recurring | Level 2 securities | U.S. government and agency securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	1,967		1,967
Gross unrealized gains	1		1
Gross unrealized losses	(80)		(80)
Fixed income securities	1,888		1,888		1,699
Recurring | Level 2 securities | Corporate debt securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	51,577		51,577
Gross unrealized gains	0		0
Gross unrealized losses	(110)		(110)
Fixed income securities	51,467		51,467		27,805
Recurring | Level 2 securities | Asset-backed securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	1,320		1,320
Gross unrealized gains	0		0
Gross unrealized losses	(33)		(33)
Fixed income securities	1,287		1,287		1,646
Recurring | Level 2 securities | Other debt securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	87		87
Gross unrealized gains	0		0
Gross unrealized losses	(3)		(3)
Fixed income securities	$ 84		$ 84		$ 104