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Restructuring Charges - Change in Restructuring Liability (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     $ 96  
Charge to Earnings $ 60 $ 44 86 $ 188
Cash Paid     (101)  
Non-cash and Other     (12)  
Restructuring reserve, ending balance 69   69  
Employee termination costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     84  
Charge to Earnings     49  
Cash Paid     (80)  
Non-cash and Other     0  
Restructuring reserve, ending balance 53   53  
Asset impairment costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     0  
Charge to Earnings     28  
Cash Paid     (7)  
Non-cash and Other     (12)  
Restructuring reserve, ending balance 9   9  
Facility exit costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     (9)  
Charge to Earnings     4  
Cash Paid     (11)  
Non-cash and Other     0  
Restructuring reserve, ending balance (16)   (16)  
Other exit costs        
Restructuring Reserve [Roll Forward]        
Restructuring reserve, beginning balance     21  
Charge to Earnings     5  
Cash Paid     (3)  
Non-cash and Other     0  
Restructuring reserve, ending balance $ 23   $ 23