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Restructuring Charges - Activity in Restructuring Reserve (Detail) - USD ($)
$ in Millions
12 Months Ended 36 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2013
Severance        
Restructuring Reserve [Roll Forward]        
Net additional (recovery) $ (2) $ 177 $ 45  
Streamlining Actions        
Restructuring Reserve [Roll Forward]        
Beginning Balance 92 125    
Net additional charges 16 59    
Net additional (recovery) 16 184    
Utilization (79) (92)    
Ending balance 29 92 125 $ 125
Operational Efficiency Initiatives 2011        
Restructuring Reserve [Roll Forward]        
Beginning Balance 28 80   107
Net additional (recovery) (9) (7) 45 43
Utilization (10) (45)   (70)
Ending balance 9 28 80 80
Operational Efficiency Initiatives 2011 | Severance        
Restructuring Reserve [Roll Forward]        
Beginning Balance 28 80   78
Net additional (recovery) (9) (7)   100
Utilization (10) (45)   (98)
Ending balance 9 28 80 80
Operational Efficiency Initiatives 2011 | Other        
Restructuring Reserve [Roll Forward]        
Beginning Balance 0 0   29
Net additional (recovery) 0 0   (57)
Utilization 0 0   28
Ending balance $ 0 $ 0 $ 0 $ 0