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Significant Accounting Policies (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2024
USD ($)
segment
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Number of reportable segments | segment 4    
Allowance for credit losses $ 864 $ 111  
Provision for bad debts 819 45 $ 29
Inventory, net $ 21,139 $ 19,691  
LIFO inventory (percentage) 62.00% 64.00%  
LIFO reserve $ 227 $ 384  
Charges (credits) associated with last-in, first-out inventory method (157) 1 (23)
Shipping and handling costs 8,657 7,776 10,537
Depreciation expense for property, plant, and equipment, and amortization of finance leases 279 272 312
Capitalized software held for internal use, net 495 353  
Capitalized software held for internal use, accumulated amortization 560 1,500  
Capitalized software held for internal use, amortization 102 101 116
Capitalized computer software, write-off 1,000    
Sales returns from customers 3,000 3,100 3,200
U.S. Pharmaceutical      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Provision for bad debts $ 725    
National Prescription Opiate Litigation      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Restricted cash   395  
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 1 year    
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 25 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 $ 1,100 $ 1,200 $ 1,100
Customer Concentration Risk | Sales Revenue, Net | Ten Largest Customers      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 69.00%    
Customer Concentration Risk | Sales Revenue, Net | CVS      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 28.00%    
Customer Concentration Risk | Accounts Receivable | Ten Largest Customers      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 43.00%    
Customer Concentration Risk | Accounts Receivable | CVS      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 24.00%    
Product Concentration Risk | Sales Revenue, Net | 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%
Product Concentration Risk | Sales Revenue, Net | Services Business      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Percentage of total consolidated revenues (percent) 2.00% 1.00% 2.00%