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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Fair Value Disclosures [Line Items]    
Cash and cash equivalents $ 4,085 $ 3,335
Other Assets    
Fair Value Disclosures [Line Items]    
Other equity investments without readily determinable fair values 81 73
Significant Other Observable Inputs (Level 2)    
Fair Value Disclosures [Line Items]    
Money market funds, at carrying value $ 2,600 $ 1,700