Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Equity Securities, FV-NI, Gain (Loss)
Equity securities, unrealized gain (loss)	$ (2,100)	$ (479)
Recurring
Schedule of Investments [Line Items]
Cash	11,633		$ 11,706
Debt Securities, Available-for-sale
Gross unrealized gains	1
Gross unrealized losses	(283)
Cash, Cash Equivalents, and Marketable Securities
Cash, cash equivalents and marketable securities	85,554		87,283
Cash, cash equivalents and marketable securities, amortized cost	83,261
Less: Restricted cash, cash equivalents, and marketable securities	(480)		(503)
Total cash, cash equivalents, and marketable securities	85,074		86,780
Recurring | Level 1 securities
Schedule of Investments [Line Items]
Equity securities	2,575		4,658
Recurring | Level 1 securities | Money market funds
Schedule of Investments [Line Items]
Money market funds	28,676		39,160
Recurring | Level 1 securities | Money market funds | Money market funds
Schedule of Investments [Line Items]
Money market funds	28,676
Recurring | Level 2 securities | Foreign government and agency securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	19
Gross unrealized gains	0
Gross unrealized losses	0
Fixed income securities	19		505
Recurring | Level 2 securities | U.S. government and agency securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	2,641
Gross unrealized gains	1
Gross unrealized losses	(89)
Fixed income securities	2,553		1,699
Recurring | Level 2 securities | Corporate debt securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	38,636
Gross unrealized gains	0
Gross unrealized losses	(146)
Fixed income securities	38,490		27,805
Recurring | Level 2 securities | Asset-backed securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	1,554
Gross unrealized gains	0
Gross unrealized losses	(45)
Fixed income securities	1,509		1,646
Recurring | Level 2 securities | Other debt securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	102
Gross unrealized gains	0
Gross unrealized losses	(3)
Fixed income securities	$ 99		$ 104