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Restructuring Charges (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Restructuring Reserve [Roll Forward]    
December 31, 2015 $ 51  
Charge to Earnings 47 $ 33
Cash Paid (41)  
Non-cash and Other (7)  
March 31, 2016 50  
Employee termination costs    
Restructuring Reserve [Roll Forward]    
December 31, 2015 30  
Charge to Earnings 34  
Cash Paid (37)  
Non-cash and Other 3  
March 31, 2016 30  
Asset impairment costs    
Restructuring Reserve [Roll Forward]    
December 31, 2015 0  
Charge to Earnings 10  
Cash Paid 0  
Non-cash and Other (10)  
March 31, 2016 0  
Facility exit costs    
Restructuring Reserve [Roll Forward]    
December 31, 2015 3  
Charge to Earnings 2  
Cash Paid (2)  
Non-cash and Other 0  
March 31, 2016 3  
Other exit costs    
Restructuring Reserve [Roll Forward]    
December 31, 2015 18  
Charge to Earnings 1  
Cash Paid (2)  
Non-cash and Other 0  
March 31, 2016 $ 17