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Restructuring Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance $ 51 $ 78  
Charge to Earnings 173 201 $ 136
Cash Paid (119) (202)  
Non-cash and Other (18) (29)  
Revision of Estimate 0 3  
December 31, 2015 87 51 78
Employee termination costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 30 58  
Charge to Earnings 133 136  
Cash Paid (90) (168)  
Non-cash and Other (2) 1  
Revision of Estimate 0 3  
December 31, 2015 71 30 58
Asset impairment costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 0 0  
Charge to Earnings 17 30  
Cash Paid (1) 0  
Non-cash and Other (16) (30)  
Revision of Estimate 0 0  
December 31, 2015 0 0 0
Facility exit costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 3 4  
Charge to Earnings 15 12  
Cash Paid (16) (13)  
Non-cash and Other 0 0  
Revision of Estimate 0 0  
December 31, 2015 2 3 4
Other exit costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 18 16  
Charge to Earnings 8 23  
Cash Paid (12) (21)  
Non-cash and Other 0 0  
Revision of Estimate 0 0  
December 31, 2015 $ 14 $ 18 $ 16