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Restructuring Charges - Change in Restructuring Liability (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     $ 77  
Charge to Earnings $ 118 $ 60 123 $ 86
Cash Paid     (48)  
Non-cash and Other     (1)  
Restructuring reserve, ending balance 151   151  
Employee termination costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     57  
Charge to Earnings     106  
Cash Paid     (34)  
Non-cash and Other     0  
Restructuring reserve, ending balance 129   129  
Asset impairment costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     8  
Charge to Earnings     0  
Cash Paid     0  
Non-cash and Other     0  
Restructuring reserve, ending balance 8   8  
Other exit costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     12  
Charge to Earnings     17  
Cash Paid     (14)  
Non-cash and Other     (1)  
Restructuring reserve, ending balance $ 14   $ 14