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Restructuring Charges - (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Restructuring Reserve [Roll Forward]    
December 31, 2016 $ 87  
Charge to Earnings 46 $ 47
Cash Paid (31)  
Non-cash and Other (12)  
March 31, 2017 90  
Employee termination costs    
Restructuring Reserve [Roll Forward]    
December 31, 2016 71  
Charge to Earnings 17  
Cash Paid (26)  
Non-cash and Other 0  
March 31, 2017 62  
Asset impairment costs    
Restructuring Reserve [Roll Forward]    
December 31, 2016 0  
Charge to Earnings 12  
Cash Paid 0  
Non-cash and Other (12)  
March 31, 2017 0  
Facility exit costs    
Restructuring Reserve [Roll Forward]    
December 31, 2016 2  
Charge to Earnings 8  
Cash Paid (4)  
Non-cash and Other 0  
March 31, 2017 6  
Other exit costs    
Restructuring Reserve [Roll Forward]    
December 31, 2016 14  
Charge to Earnings 9  
Cash Paid (1)  
Non-cash and Other 0  
March 31, 2017 $ 22