Severance and Exit Costs 2 (Details) (USD $)
In Millions, unless otherwise specified
 20 Months Ended
Dec. 31, 2014
Employee
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]        
Accrued balance $ 43 $ 84 $ 76 $ 39
Severance [Member]        
Restructuring Cost and Reserve [Line Items]        
Accrued balance 22 55 45 16
Facility Exit [Member]        
Restructuring Cost and Reserve [Line Items]        
Accrued balance 21 29 31 23
Fiscal 2014 Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Workforce rebalancing (number of employees) 1,900      
Expected cost 191      
Fiscal 2014 Plan [Member] | Severance [Member]        
Restructuring Cost and Reserve [Line Items]        
Cost incurred to date 169      
Fiscal 2014 Plan [Member] | Facility Exit [Member]        
Restructuring Cost and Reserve [Line Items]        
Cost incurred to date 22      
Plans and Actions Prior to Fiscal 2014 Plan [Member] | Severance [Member]        
Restructuring Cost and Reserve [Line Items]        
Accrued balance     5  
Plans and Actions Prior to Fiscal 2014 Plan [Member] | Facility Exit [Member]        
Restructuring Cost and Reserve [Line Items]        
Accrued balance $ 10   $ 14