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Restructuring, Facility Consolidation and Severance Charges (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]        
Severance, asset impairment and other restructuring charges $ 57 $ 20 $ 83 $ 40
Restructuring Charges        
Restructuring Cost and Reserve [Line Items]        
Severance, asset impairment and other restructuring charges $ 57 $ 20 $ 83 $ 40