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Restructuring Charges - (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring Reserve [Roll Forward]    
December 31, 2017 $ 162  
Charge to Earnings 144 $ 46
Cash Paid (77)  
Non-cash and Other (12)  
March 31, 2018 217  
Employee termination costs    
Restructuring Reserve [Roll Forward]    
December 31, 2017 131  
Charge to Earnings 118  
Cash Paid (62)  
Non-cash and Other 0  
March 31, 2018 187  
Asset impairment costs    
Restructuring Reserve [Roll Forward]    
December 31, 2017 0  
Charge to Earnings 15  
Cash Paid 0  
Non-cash and Other (15)  
March 31, 2018 0  
Facility exit costs    
Restructuring Reserve [Roll Forward]    
December 31, 2017 2  
Charge to Earnings 7  
Cash Paid (9)  
Non-cash and Other 0  
March 31, 2018 0  
Other exit costs    
Restructuring Reserve [Roll Forward]    
December 31, 2017 29  
Charge to Earnings 4  
Cash Paid (6)  
Non-cash and Other 3  
March 31, 2018 $ 30