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Debt - Activity (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 25, 2019
Dec. 31, 2018
Committed multi-currency revolving credit facilities due 2021      
Revolving credit facility      
Available borrowing capacity under line of credit facility $ 1,450    
Short-term uncommitted credit facilities      
Revolving credit facility      
Available borrowing capacity under line of credit facility 1,100    
Amount of credit facility outstanding and due on demand $ 371   $ 211
2018 Revolver      
Revolving credit facility      
Maximum borrowing capacity of revolving credit facility   $ 2,550