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Equity Investments (Details) - USD ($)
$ in Millions
9 Months Ended
Jul. 07, 2020
Sep. 30, 2020
Sep. 30, 2019
Equity Investments Without Readily Determinable Fair Value [Roll Forward]      
Balance as of December 31, 2019   $ 86  
Jio   6,302 $ 61
Adjustments   (9)  
Balance as of September 30, 2020   6,164  
Jio      
Equity Investments Without Readily Determinable Fair Value [Roll Forward]      
Jio   5,824  
Other investments $ 5,820    
Other investments      
Equity Investments Without Readily Determinable Fair Value [Roll Forward]      
Other investments   $ 263