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v3.25.1

Significant Accounting Policies - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 USD ($) | Mar. 31, 2025 USD ($) segment | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Number of reportable segments | segment |  | 4 |  |
Allowance for credit losses |  | $ 450 | $ 864 |
Provision for bad debts |  | (130) | 819 | $ 45
Inventory, net |  | $ 23,001 | $ 21,139 |
LIFO inventory (percentage) |  | 63.00% | 62.00% |
LIFO reserve |  | $ 309 | $ 227 |
Charges (credits) associated with last-in, first-out inventory method |  | 82 | (157) | 1
Shipping and handling costs |  | 8,507 | 8,657 | 7,776
Depreciation expense for property, plant, and equipment, and amortization of finance leases |  | 272 | 279 | 272
Derecognition of finite-lived intangible assets | $ 1,400 |  | 1,400 |
Capitalized software held for internal use, net |  | 681 | 495 |
Capitalized software held for internal use, accumulated amortization |  | 657 | 560 |
Capitalized software held for internal use, amortization |  | 135 | 102 | 101
Capitalized computer software, write-off |  |  | 1,000 |
Sales returns from customers |  | 2,900 | 3,000 | 3,100
U.S. Pharmaceutical |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Provision for bad debts |  | (206) | 725 |
Allowance for credit loss, writeoff |  | $ 237 |  |
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 | $ 1,100 | $ 1,200
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) |  | 72.00% |  |
Customer Concentration Risk | Sales Revenue, Net | CVS |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Percentage of total consolidated revenues (percent) |  | 24.00% |  |
Customer Concentration Risk | Accounts Receivable | Ten Largest Customers |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Percentage of total consolidated revenues (percent) |  | 48.00% |  |
Customer Concentration Risk | Accounts Receivable | CVS |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Percentage of total consolidated revenues (percent) |  | 23.00% |  |
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) |  | 99.00% | 98.00% | 99.00%
Product Concentration Risk | Sales Revenue, Net | Services Business |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Percentage of total consolidated revenues (percent) |  | 1.00% | 2.00% | 1.00%

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