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Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Equity Securities, FV-NI, Gain (Loss)      
Equity securities, unrealized gain (loss) $ (479) $ (8,100)  
Recurring      
Schedule of Investments [Line Items]      
Cash 10,968   $ 10,666
Debt Securities, Available-for-sale      
Gross unrealized gains 1    
Gross unrealized losses (636)    
Cash, Cash Equivalents, and Marketable Securities      
Cash, cash equivalents and marketable securities 64,796   70,391
Cash, cash equivalents and marketable securities, amortized cost 62,200    
Less: Restricted cash, cash equivalents, and marketable securities (391)   (365)
Total cash, cash equivalents, and marketable securities 64,405   70,026
Recurring | Level 1 securities      
Schedule of Investments [Line Items]      
Equity securities 3,231   3,709
Recurring | Level 1 securities | Money market funds      
Schedule of Investments [Line Items]      
Money market funds 35,861   27,899
Recurring | Level 1 securities | Money market funds | Money market funds      
Schedule of Investments [Line Items]      
Money market funds 35,861    
Recurring | Level 2 securities | Foreign government and agency securities      
Debt Securities, Available-for-sale      
Fixed income securities, amortized cost 28    
Gross unrealized gains 0    
Gross unrealized losses (1)    
Fixed income securities 27   535
Recurring | Level 2 securities | U.S. government and agency securities      
Debt Securities, Available-for-sale      
Fixed income securities, amortized cost 2,341    
Gross unrealized gains 1    
Gross unrealized losses (124)    
Fixed income securities 2,218   2,146
Recurring | Level 2 securities | Corporate debt securities      
Debt Securities, Available-for-sale      
Fixed income securities, amortized cost 10,193    
Gross unrealized gains 0    
Gross unrealized losses (384)    
Fixed income securities 9,809   22,627
Recurring | Level 2 securities | Asset-backed securities      
Debt Securities, Available-for-sale      
Fixed income securities, amortized cost 2,572    
Gross unrealized gains 0    
Gross unrealized losses (118)    
Fixed income securities 2,454   2,572
Recurring | Level 2 securities | Other fixed income securities      
Debt Securities, Available-for-sale      
Fixed income securities, amortized cost 237    
Gross unrealized gains 0    
Gross unrealized losses (9)    
Fixed income securities $ 228   $ 237