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Significant Accounting Policies (Details)
12 Months Ended
Mar. 31, 2016
USD ($)
customer
segment
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Accounting Policies [Abstract]        
Number of operating segments | segment 2      
Restricted cash balance $ 939,000,000 $ 0    
Significant Accounting Policies [Line Items]        
LIFO inventory, percentage 74.00% 73.00%    
LIFO reserve $ 1,012,000,000 $ 768,000,000    
Charges associated with last-in-first-out inventory method $ 244,000,000 337,000,000 $ 311,000,000  
LIFO inventory, excess of market       $ 60,000,000
LIFO to market adjustment     60,000,000  
Capitalized software held for sale, useful life 3 years      
Capitalized software held for internal use, net $ 435,000,000 435,000,000    
Capitalized software held for internal use, accumulated amortization 1,130,000,000 1,112,000,000    
Sales returns from customers 3,100,000,000 2,700,000,000 1,900,000,000  
Supplier reserves 144,000,000 167,000,000    
Current net deferred tax liabilities 0 (1,820,000,000)    
New Accounting Pronouncement, Early Adoption, Effect        
Significant Accounting Policies [Line Items]        
Current net deferred tax liabilities $ 2,000,000,000      
Minimum        
Significant Accounting Policies [Line Items]        
Property, plant and equipment, useful life 1 year      
Intangible assets, useful life 1 year      
Capitalized software held for internal use, useful life 1 year      
Maximum        
Significant Accounting Policies [Line Items]        
Property, plant and equipment, useful life 30 years      
Intangible assets, useful life 38 years      
Capitalized software held for internal use, useful life 10 years      
Selling, Distribution and Administrative Expenses        
Significant Accounting Policies [Line Items]        
Shipping and handling costs $ 789,000,000 $ 819,000,000 $ 535,000,000  
Customer Concentration Risk | Sales Revenue, Net        
Significant Accounting Policies [Line Items]        
Number of largest customers | customer 10      
Percentage of total consolidated revenues 52.40%      
Customer Concentration Risk | Sales Revenue, Net | CVS        
Significant Accounting Policies [Line Items]        
Percentage of total consolidated revenues 20.30%      
Customer Concentration Risk | Accounts Receivable        
Significant Accounting Policies [Line Items]        
Number of largest customers | customer 10      
Percentage of total consolidated revenues 32.00%      
Customer Concentration Risk | Accounts Receivable | CVS        
Significant Accounting Policies [Line Items]        
Percentage of total consolidated revenues 18.00%