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Restructuring Charges - Activity in Restructuring Reserve (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 60 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2015
Severance        
Restructuring Reserve [Roll Forward]        
Net additional charges (net recovery/gain) $ 1      
Streamlining Actions        
Restructuring Reserve [Roll Forward]        
Beginning Balance 29      
Net additional charges 0   $ 75  
Net additional charges (net recovery/gain) 0 $ (5)    
Utilization (15)   (171)  
Ending balance 14 29 29 $ 29
Operational Efficiency Initiatives 2011        
Restructuring Reserve [Roll Forward]        
Beginning Balance 9     107
Net additional charges (net recovery/gain) (1) 1   27
Utilization (1)     (125)
Ending balance 7 9 9 9
Operational Efficiency Initiatives 2011 | Severance        
Restructuring Reserve [Roll Forward]        
Beginning Balance 9     78
Net additional charges (net recovery/gain) (1)     84
Utilization (1)     (153)
Ending balance 7 9 9 9
Operational Efficiency Initiatives 2011 | Other        
Restructuring Reserve [Roll Forward]        
Beginning Balance 0     29
Net additional charges (net recovery/gain) 0     (57)
Utilization 0     28
Ending balance $ 0 $ 0 $ 0 $ 0