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Significant Equity Investments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]        
Investee financial information percentage     100.00%  
Income from significant equity investments $ 31 $ 17 $ 68 $ 39
Significant Equity Investments        
Schedule of Equity Method Investments [Line Items]        
Income from significant equity investments     $ 66 $ 37