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Supplemental Financial Information - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Property, Plant and Equipment [Line Items]    
Right-of-use asset obtained in exchange for operating lease liability $ 35 $ 140
Right-of-use asset obtained in exchange for finance lease liability 7  
Lease not yet commenced, assumption and judgment, value of underlying asset, amount 45  
Property, Plant and Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, additions $ 42 $ 49