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Significant Accounting Policies - Foreign Currency Translation (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Foreign Currency Translation      
Loss on deconsolidation of Venezuelan subsidiary   $ 162  
Foreign currency transaction loss   $ 201 $ (92)
Venezuela      
Foreign Currency Translation      
Loss on deconsolidation of Venezuelan subsidiary $ 162    
Foreign currency transaction loss $ (144)