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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]        
Provision for (benefit from) income taxes $ (101) $ 23 $ (395) $ (215)
Increase in gross unrecognized tax benefits     206  
Unrecognized tax benefits that would impact effective tax rate 50   50  
Unrecognized tax benefits that would not impact effective tax rate $ 156   $ 156