Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Equity Securities, FV-NI, Gain (Loss)
Equity securities, unrealized gain (loss)	$ 1,200	$ 1,000	$ 1,000	$ (11,300)
Recurring
Schedule of Investments [Line Items]
Cash	10,090		10,090		$ 10,666
Debt Securities, Available-for-sale
Gross unrealized gains	0		0
Gross unrealized losses	(506)		(506)
Cash, Cash Equivalents, and Marketable Securities
Cash, cash equivalents and marketable securities	64,645		64,645		70,391
Cash, cash equivalents and marketable securities, amortized cost	60,467		60,467
Less: Restricted cash, cash equivalents, and marketable securities	(476)		(476)		(365)
Total cash, cash equivalents, and marketable securities	64,169		64,169		70,026
Recurring | Level 1 securities
Schedule of Investments [Line Items]
Equity securities	4,684		4,684		3,709
Recurring | Level 1 securities | Money market funds
Schedule of Investments [Line Items]
Money market funds	20,424		20,424		27,899
Recurring | Level 1 securities | Money market funds | Money market funds
Schedule of Investments [Line Items]
Money market funds	20,424		20,424
Recurring | Level 2 securities | Foreign government and agency securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	28		28
Gross unrealized gains	0		0
Gross unrealized losses	(1)		(1)
Fixed income securities	27		27		535
Recurring | Level 2 securities | U.S. government and agency securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	3,322		3,322
Gross unrealized gains	0		0
Gross unrealized losses	(128)		(128)
Fixed income securities	3,194		3,194		2,146
Recurring | Level 2 securities | Corporate debt securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	24,542		24,542
Gross unrealized gains	0		0
Gross unrealized losses	(287)		(287)
Fixed income securities	24,255		24,255		22,627
Recurring | Level 2 securities | Asset-backed securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	1,892		1,892
Gross unrealized gains	0		0
Gross unrealized losses	(84)		(84)
Fixed income securities	1,808		1,808		2,572
Recurring | Level 2 securities | Other debt securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	169		169
Gross unrealized gains	0		0
Gross unrealized losses	(6)		(6)
Fixed income securities	$ 163		$ 163		$ 237