XML 77 R66.htm IDEA: XBRL DOCUMENT
v3.25.3

Stockholders' Deficit - Schedule of Share Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025 | Jul. 31, 2025
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |  |  |  |  |
Beginning balance |  |  | $ 7,469 |  | $ 6,615 | $ 7,469 | $ 6,615 | $ 6,615 |
July 2024 Board Authorization |  |  |  |  |  |  |  |  | $ 4,000
Ending balance | $ 8,560 | $ 6,070 |  | $ 8,560 |  | 6,070 | 8,560 | 7,469 |
Excise taxes |  |  |  |  |  | 10 |  | $ 26 |
Open Market Transactions |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Total Number of Shares Purchased (in shares) |  | 1.2 | 0.8 | 2.9 | 1.0 |  |  |  |
Average Price Paid Per Share (in dollars per share) |  | $ 693.25 | $ 709.84 | $ 533.46 | $ 548.20 |  |  |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |  |  |  |  |
Shares repurchased |  | $ (809) | $ (590) | $ (1,528) | $ (527) |  |  |  |
Total dollar value, accrued |  | 809 | $ 590 | 1,528 | $ 527 |  |  |  |
Open Market Transactions | Other Accrued Liabilities |  |  |  |  |  |  |  |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |  |  |  |  |
Shares repurchased | (22) |  |  |  |  |  |  |  |
Total dollar value, accrued | $ 22 |  |  |  |  |  |  |  |
Share Repurchase Transactions |  |  |  |  |  |  |  |  |
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs |  |  |  |  |  |  |  |  |
Excise taxes |  | $ 8 |  | $ 15 |  | $ 10 | $ 16 |  |

X
- Definition Excise Tax Accrual + References No definition available. + Details
Name: | mck_ExciseTaxAccrual
Namespace Prefix: | mck_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Share Repurchases, Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs + References No definition available. + Details
Name: | mck_ShareRepurchasesApproximateDollarValueOfSharesThatMayYetBePurchasedUnderTheProgramsRollForward
Namespace Prefix: | mck_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
Name: | srt_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AcceleratedShareRepurchasesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481549/505-30-45-1 + Details
Name: | us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 + Details
Name: | us-gaap_TreasuryStockSharesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481549/505-30-45-1 + Details
Name: | us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_ShareRepurchaseProgramAxis=mck_OpenMarketTransactionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementOfFinancialPositionLocationActivityCapitalizationAxis=us-gaap_OtherCurrentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ShareRepurchaseProgramAxis=mck_ShareRepurchaseTransactionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |