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Investments - Equity Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]            
Equity investment $ 9,279   $ 0      
Equity investments without readily determinable fair values 243 $ 571 539 $ 264 $ 261 $ 307
Equity investments under the equity method of accounting 33   8      
Total equity investments 10,348   547      
Short-term investments:            
Schedule of Investments [Line Items]            
Equity investment 793   0      
Adevinta            
Schedule of Investments [Line Items]            
Equity investment $ 9,279   $ 0