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Significant Accounting Policies - Narrative (Details)
$ in Millions
12 Months Ended
Mar. 31, 2026
USD ($)
segment
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Number of reportable segments | segment 4    
Allowance for credit losses $ 194 $ 450  
Provision for bad debts 100 (130) $ 819
Inventory, net $ 24,207 $ 23,001  
LIFO inventory (percentage) 59.00% 63.00%  
LIFO reserve $ 99 $ 309  
Charges (credits) associated with last-in, first-out inventory method (210) 82 (157)
Shipping and handling costs 8,096 8,507 8,657
Depreciation expense for property, plant, and equipment, and amortization of finance leases 287 272 279
Capitalized software held for internal use, net 764 681  
Capitalized software held for internal use, accumulated amortization 750 657  
Capitalized software held for internal use, amortization 164 135 102
Sales returns from customers 2,500 2,900 3,000
Contract liabilities $ 366 354  
Real Property      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Renewal option increments for leases (in years) 5 years    
Minimum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Intangible assets, useful life 3 years    
Minimum | Building and improvements      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Property, plant and equipment, useful life 15 years    
Minimum | Machinery, equipment, and other      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Property, plant and equipment, useful life 3 years    
Minimum | Building      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Lease term (in years) 1 year    
Minimum | Equipment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Lease term (in years) 1 year    
Maximum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Intangible assets, useful life 26 years    
Capitalized software held for internal use, useful life 10 years    
Maximum | Building and improvements      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Property, plant and equipment, useful life 30 years    
Maximum | Machinery, equipment, and other      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Property, plant and equipment, useful life 15 years    
Maximum | Building      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Lease term (in years) 15 years    
Maximum | Equipment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Lease term (in years) 5 years    
Shipping and Handling      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Shipping and handling costs $ 1,200 $ 1,100 $ 1,100
Sales Revenue, Net | Product Concentration Risk | Distribution and Retail Business      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 98.00% 99.00% 98.00%
Sales Revenue, Net | Product Concentration Risk | Services Business      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 2.00% 1.00% 2.00%
Ten Largest Customers | Sales Revenue, Net | Customer Concentration Risk      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 73.00%    
Ten Largest Customers | Accounts Receivable | Customer Concentration Risk      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 43.00%    
CVS | Sales Revenue, Net | Customer Concentration Risk      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 24.00%    
CVS | Accounts Receivable | Customer Concentration Risk      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 21.00%    
Second Largest Customer | Sales Revenue, Net | Customer Concentration Risk      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 11.00%    
Third Largest Customer | Sales Revenue, Net | Customer Concentration Risk      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 10.00%    
North American Pharmaceutical      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Provision for bad debts   $ (206) $ 725
Allowance for credit loss, writeoff $ 483 $ 237