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Debt - Activity (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Mar. 25, 2019
Dec. 31, 2018
Committed multi-currency revolving credit facilities due 2024      
Revolving credit facility      
Maximum borrowing capacity of revolving credit facility   $ 1,750  
Available borrowing capacity under line of credit facility $ 1,270    
Short-term uncommitted credit facilities      
Revolving credit facility      
Available borrowing capacity under line of credit facility 1,500    
Amount of credit facility outstanding and due on demand $ 364   $ 211