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v3.22.1

Significant Accounting Policies (Details) $ in Millions | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 segment | Mar. 31, 2021 USD ($) segment | Mar. 31, 2022 USD ($) segment | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Number of reportable segments | segment | 4 | 4 | 4 |  |
Allowance for credit losses |  | $ 198 | $ 89 | $ 198 |
Inventory, net |  | $ 19,246 | $ 18,702 | $ 19,246 |
LIFO inventory (percentage) |  | 58.00% | 63.00% | 58.00% |
LIFO reserve |  | $ 406 | $ 383 | $ 406 |
Credits associated with last-in, first-out inventory method |  |  | 23 | 38 | $ 252
Shipping and handling costs |  |  | 10,537 | 8,849 | 9,182
Depreciation expense for property, plant, and equipment, and amortization of finance leases |  |  | 312 | 344 | 335
Capitalized software held for internal use, net |  | 513 | 320 | 513 |
Capitalized software held for internal use, accumulated amortization |  | $ 1,400 | 1,400 | 1,400 |
Capitalized software held for internal use, amortization |  |  | 116 | 117 | 129
Sales returns from customers |  |  | 3,200 | 3,100 | 3,100
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 |  |
Medical-Surgical Solutions |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Inventory write-down charges |  |  | $ 164 | 136 |
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 |  |  | 1 year |  |
Minimum | Equipment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Lease term |  |  | 1 year |  |
Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Intangible assets, useful life |  |  | 24 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 |  |  | 15 years |  |
Maximum | Equipment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Lease term |  |  | 5 years |  |
Shipping and Handling |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Shipping and handling costs |  |  | $ 1,100 | $ 1,000 | $ 1,000
Customer Concentration Risk | Sales Revenue, Net | CVS |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Percentage of total consolidated revenues (percent) |  |  | 21.00% |  |
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) |  |  | 52.00% |  |
Customer Concentration Risk | Accounts Receivable | 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% |  |
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% | 98.00% | 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% | 2.00% | 2.00%

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