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Restructuring and Transaction Costs (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Cost And Reserve [Line Items]        
Restructuring and transaction costs $ 12 $ 85 $ 63 $ 85
Reduction of workforce [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and transaction costs     63  
Expense associated with accelerated awards   26 24  
Reduction of workforce [Member] | Defined Benefit Settlements [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and transaction costs   15 $ 5  
Reduction of workforce [Member] | Employee Related Costs [Member]        
Restructuring Cost And Reserve [Line Items]        
Restructuring and transaction costs   $ 85