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v3.26.1

Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended
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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 |

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