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Restructuring and Transaction Costs (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Restructuring Cost And Reserve [Line Items]        
Restructuring and transaction costs $ 32 $ 10 $ 32 $ 73
Reduction of workforce [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and transaction costs 32      
Expense associated with accelerated awards $ 11      
Reduction of workforce [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and transaction costs       73
Expense associated with accelerated awards       27
Reduction of workforce [Member] | Defined Benefit Settlements [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and transaction costs       $ 5