Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity Securities, FV-NI, Gain (Loss)
Equity securities, unrealized gain (loss)	$ (13,600)	$ 11,600	$ 448
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Equity Securities, FV-NI, Gain (Loss)
Equity investment, fair value	2,900	15,600
Equity investment, discount due to lack of marketability		800
Recurring
Schedule of Investments [Line Items]
Cash	10,666	10,942
Cost or Amortized Cost
Cash, cash equivalents and short-term investments	67,484	79,012
Gross Unrealized Gains
Cash equivalents and marketable securities	0	93
Gross Unrealized Losses
Cash equivalents and marketable securities	(802)	(182)
Total Estimated Fair Value
Cash, cash equivalents and short-term investments	70,391	96,309
Less: Restricted cash, cash equivalents, and marketable securities	(365)	(260)
Total cash, cash equivalents, and marketable securities	70,026	96,049
Recurring | Level 1 securities
Total Estimated Fair Value
Equity securities	3,709	1,646
Recurring | Level 1 securities | Money market funds
Schedule of Investments [Line Items]
Money market funds	27,899	20,312
Recurring | Level 1 securities | Money market funds | Money market funds
Schedule of Investments [Line Items]
Money market funds	27,899
Recurring | Level 2 securities
Total Estimated Fair Value
Equity securities		15,740
Recurring | Level 2 securities | Foreign government and agency securities
Cost or Amortized Cost
Cash equivalents and marketable securities	537	181
Gross Unrealized Gains
Cash equivalents and marketable securities	0	0
Gross Unrealized Losses
Cash equivalents and marketable securities	(2)	0
Total Estimated Fair Value
Cash equivalents and marketable securities	535	181
Recurring | Level 2 securities | U.S. government and agency securities
Cost or Amortized Cost
Cash equivalents and marketable securities	2,301	4,316
Gross Unrealized Gains
Cash equivalents and marketable securities	0	9
Gross Unrealized Losses
Cash equivalents and marketable securities	(155)	(25)
Total Estimated Fair Value
Cash equivalents and marketable securities	2,146	4,300
Recurring | Level 2 securities | Corporate debt securities
Cost or Amortized Cost
Cash equivalents and marketable securities	23,111	35,810
Gross Unrealized Gains
Cash equivalents and marketable securities	0	75
Gross Unrealized Losses
Cash equivalents and marketable securities	(484)	(121)
Total Estimated Fair Value
Cash equivalents and marketable securities	22,627	35,764
Recurring | Level 2 securities | Asset-backed securities
Cost or Amortized Cost
Cash equivalents and marketable securities	2,721	6,763
Gross Unrealized Gains
Cash equivalents and marketable securities	0	7
Gross Unrealized Losses
Cash equivalents and marketable securities	(149)	(32)
Total Estimated Fair Value
Cash equivalents and marketable securities	2,572	6,738
Recurring | Level 2 securities | Other fixed income securities
Cost or Amortized Cost
Cash equivalents and marketable securities	249	688
Gross Unrealized Gains
Cash equivalents and marketable securities	0	2
Gross Unrealized Losses
Cash equivalents and marketable securities	(12)	(4)
Total Estimated Fair Value
Cash equivalents and marketable securities	$ 237	$ 686