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Significant Accounting Policies - Foreign Currency Translation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Foreign Currency Translation        
Foreign currency transaction loss $ (12)   $ (11)  
Venezuela        
Foreign Currency Translation        
Loss on deconsolidation of Venezuelan subsidiary   $ 162   $ 162
Foreign currency transaction loss   $ 144