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Restructuring Charges - (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Reserve [Roll Forward]        
December 31, 2016     $ 87  
Charge to Earnings $ 45 $ 29 150 $ 116
Cash Paid     (113)  
Non-cash and Other     (13)  
September 30, 2017 111   111  
Employee termination costs        
Restructuring Reserve [Roll Forward]        
December 31, 2016     71  
Charge to Earnings     96  
Cash Paid     (85)  
Non-cash and Other     0  
September 30, 2017 82   82  
Asset impairment costs        
Restructuring Reserve [Roll Forward]        
December 31, 2016     0  
Charge to Earnings     23  
Cash Paid     0  
Non-cash and Other     (23)  
September 30, 2017 0   0  
Facility exit costs        
Restructuring Reserve [Roll Forward]        
December 31, 2016     2  
Charge to Earnings     18  
Cash Paid     (17)  
Non-cash and Other     0  
September 30, 2017 3   3  
Other exit costs        
Restructuring Reserve [Roll Forward]        
December 31, 2016     14  
Charge to Earnings     13  
Cash Paid     (11)  
Non-cash and Other     10  
September 30, 2017 $ 26   $ 26