Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Equity Securities, FV-NI, Gain (Loss)
Equity securities, unrealized gain (loss)	$ 284	$ (4,200)	$ (195)	$ (12,300)
Recurring
Schedule of Investments [Line Items]
Cash	11,142		11,142		$ 10,666
Debt Securities, Available-for-sale
Gross unrealized gains	0		0
Gross unrealized losses	(594)		(594)
Cash, Cash Equivalents, and Marketable Securities
Cash, cash equivalents and marketable securities	64,508		64,508		70,391
Cash, cash equivalents and marketable securities, amortized cost	61,587		61,587
Less: Restricted cash, cash equivalents, and marketable securities	(538)		(538)		(365)
Total cash, cash equivalents, and marketable securities	63,970		63,970		70,026
Recurring | Level 1 securities
Schedule of Investments [Line Items]
Equity securities	3,515		3,515		3,709
Recurring | Level 1 securities | Money market funds
Schedule of Investments [Line Items]
Money market funds	29,095		29,095		27,899
Recurring | Level 1 securities | Money market funds | Money market funds
Schedule of Investments [Line Items]
Money market funds	29,095		29,095
Recurring | Level 2 securities | Foreign government and agency securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	273		273
Gross unrealized gains	0		0
Gross unrealized losses	(1)		(1)
Fixed income securities	272		272		535
Recurring | Level 2 securities | U.S. government and agency securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	2,304		2,304
Gross unrealized gains	0		0
Gross unrealized losses	(133)		(133)
Fixed income securities	2,171		2,171		2,146
Recurring | Level 2 securities | Corporate debt securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	16,469		16,469
Gross unrealized gains	0		0
Gross unrealized losses	(351)		(351)
Fixed income securities	16,118		16,118		22,627
Recurring | Level 2 securities | Asset-backed securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	2,103		2,103
Gross unrealized gains	0		0
Gross unrealized losses	(101)		(101)
Fixed income securities	2,002		2,002		2,572
Recurring | Level 2 securities | Other debt securities
Debt Securities, Available-for-sale
Fixed income securities, amortized cost	201		201
Gross unrealized gains	0		0
Gross unrealized losses	(8)		(8)
Fixed income securities	$ 193		$ 193		$ 237