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Restructuring Charges- Additional Information (Detail)
$ in Millions
3 Months Ended 12 Months Ended 39 Months Ended
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2011
USD ($)
position
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Streamlining Actions          
Restructuring Cost and Reserve [Line Items]          
Net additional charges (net recovery/gain) $ 8 $ (2)      
Restructuring reserve 49 65   $ 65 $ 125
Operational Efficiency Initiatives 2011          
Restructuring Cost and Reserve [Line Items]          
Net additional charges (net recovery/gain) 0 (2)   34  
Restructuring reserve 20 22 $ 107 22  
Estimated reduction in workforce due to restructuring (positions) | position     1,500    
Severance          
Restructuring Cost and Reserve [Line Items]          
Net additional charges (net recovery/gain) 8        
Severance | Operational Efficiency Initiatives 2011          
Restructuring Cost and Reserve [Line Items]          
Net additional charges (net recovery/gain) 0     91  
Restructuring reserve 20 22 $ 78 22  
Other | Operational Efficiency Initiatives 2011          
Restructuring Cost and Reserve [Line Items]          
Net additional charges (net recovery/gain) 0     (57)  
Restructuring reserve $ 0 $ 0 $ 29 $ 0