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Restructuring Charges (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]    
Restructuring liability $ 78 $ 91
Other Current Liabilities    
Restructuring Cost and Reserve [Line Items]    
Restructuring liability 24  
Other Liabilities    
Restructuring Cost and Reserve [Line Items]    
Restructuring liability $ 54