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Investments and Fair Value Measurement - Summarized Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Results of Operations Data            
Loss from operations $ (572) $ (1,116)   $ (3,284) $ (3,986)  
Net loss (2,424) $ (1,089)   (1,388) $ (5,799)  
Balance Sheet Data            
Total current assets 9,684     9,684   $ 9,882
Total assets 36,884     36,884   33,252
Total current liabilities 8,126     8,126   6,865
Total liabilities 22,599     22,599   19,498
Redeemable non-controlling interests $ 229     $ 229   $ 787
Aurora            
Results of Operations Data            
Total operating expenses     $ 373      
Loss from operations     (373)      
Net loss     (370)      
Balance Sheet Data            
Total current assets     808      
Total assets     2,796      
Total current liabilities     72      
Total liabilities     254      
Redeemable non-controlling interests     $ 2,161