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Description of Business and Basis of Consolidation and Presentation (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Segment Reporting [Abstract]          
Number of reportable segments | segment       3  
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Income tax expense reduction $ (42)   $ (6) $ (163) $ (73)
Initial Recognition of Global Intangible Low-taxed Income of Foreign Subsidiaries          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Income tax expense reduction   $ 35