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Restructuring Charges - Change in Restructuring Liability (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance $ 77  
Charge to Earnings 5 $ 26
Cash Paid (17)  
Non-cash and Other (2)  
Restructuring reserve, ending balance 63  
Employee termination costs    
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance 57  
Charge to Earnings 3  
Cash Paid (12)  
Non-cash and Other 0  
Restructuring reserve, ending balance 48  
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  
Facility exit costs    
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance 0  
Charge to Earnings 2  
Cash Paid (2)  
Non-cash and Other 0  
Restructuring reserve, ending balance 0  
Other exit costs    
Restructuring Reserve [Roll Forward]    
Restructuring reserve, beginning balance 12  
Charge to Earnings 0  
Cash Paid (3)  
Non-cash and Other 2  
Restructuring reserve, ending balance $ 7