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Restructuring Charges - Change in Restructuring Liability (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance $ 96  
Charge to Earnings 26 $ 144
Cash Paid (52)  
Non-cash and Other 4  
Restructuring reserve, ending balance 74  
Employee termination costs    
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance 84  
Charge to Earnings 20  
Cash Paid (45)  
Non-cash and Other 0  
Restructuring reserve, ending balance 59  
Asset impairment costs    
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance 0  
Charge to Earnings 0  
Cash Paid 0  
Non-cash and Other 4  
Restructuring reserve, ending balance 4  
Facility exit costs    
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance (9)  
Charge to Earnings 2  
Cash Paid (4)  
Non-cash and Other 0  
Restructuring reserve, ending balance (11)  
Other exit costs    
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance 21  
Charge to Earnings 4  
Cash Paid (3)  
Non-cash and Other 0  
Restructuring reserve, ending balance $ 22