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Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Equity Securities, FV-NI, Gain (Loss)          
Equity securities, unrealized gain (loss) $ 1,000 $ (116) $ (11,300) $ 6  
Rivian          
Equity Securities, FV-NI, Gain (Loss)          
Equity investment, fair value 5,200   5,200   $ 15,600
Equity investment, discount due to lack of marketability         800
Recurring          
Schedule of Investments [Line Items]          
Cash 10,720   10,720   10,942
Debt Securities, Available-for-sale          
Gross unrealized gains 0   0    
Gross unrealized losses (1,183)   (1,183)    
Cash, Cash Equivalents, and Marketable Securities          
Cash, cash equivalents and marketable securities 58,893   58,893   96,309
Cash, cash equivalents and marketable securities, amortized cost 54,069   54,069    
Less: Restricted cash, cash equivalents, and marketable securities (231)   (231)   (260)
Total cash, cash equivalents, and marketable securities 58,662   58,662   96,049
Recurring | Level 1 securities          
Schedule of Investments [Line Items]          
Equity securities 5,988   5,988   1,646
Recurring | Level 1 securities | Money market funds          
Schedule of Investments [Line Items]          
Money market funds 16,697   16,697   20,312
Recurring | Level 1 securities | Money market funds | Money market funds          
Schedule of Investments [Line Items]          
Money market funds 16,697   16,697    
Recurring | Level 2 securities          
Schedule of Investments [Line Items]          
Equity securities 19   19   15,740
Recurring | Level 2 securities | Foreign government and agency securities          
Debt Securities, Available-for-sale          
Fixed income securities, amortized cost 141   141    
Gross unrealized gains 0   0    
Gross unrealized losses (2)   (2)    
Fixed income securities 139   139   181
Recurring | Level 2 securities | U.S. government and agency securities          
Debt Securities, Available-for-sale          
Fixed income securities, amortized cost 2,301   2,301    
Gross unrealized gains 0   0    
Gross unrealized losses (169)   (169)    
Fixed income securities 2,132   2,132   4,300
Recurring | Level 2 securities | Corporate debt securities          
Debt Securities, Available-for-sale          
Fixed income securities, amortized cost 20,229   20,229    
Gross unrealized gains 0   0    
Gross unrealized losses (799)   (799)    
Fixed income securities 19,430   19,430   35,764
Recurring | Level 2 securities | Asset-backed securities          
Debt Securities, Available-for-sale          
Fixed income securities, amortized cost 3,578   3,578    
Gross unrealized gains 0   0    
Gross unrealized losses (191)   (191)    
Fixed income securities 3,387   3,387   6,738
Recurring | Level 2 securities | Other fixed income securities          
Debt Securities, Available-for-sale          
Fixed income securities, amortized cost 403   403    
Gross unrealized gains 0   0    
Gross unrealized losses (22)   (22)    
Fixed income securities $ 381   $ 381   $ 686