XML 109 R91.htm IDEA: XBRL DOCUMENT
v3.22.1

Debt and Financing Activities - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Aug. 12, 2021 | Jul. 23, 2021 | Jul. 17, 2021 | Mar. 31, 2021 | Dec. 03, 2020
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 5,879 |  |  |  | $ 7,148 |
Less: Current portion | 799 |  |  |  | 742 |
Total long-term debt | 5,080 |  |  |  | 6,406 |
Held-for-sale | European Businesses (Disposal Group) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current portion of long-term debt | 4 |  |  |  |  |
Long-term debt | 11 |  |  |  |  |
Loans payable | 2.70% Notes due December 15, 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 400 |  |  |  | 400 |
Debt interest rate (percent) | 2.70% |  |  |  |  |
Loans payable | 2.85% Notes due March 15, 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 360 |  |  |  | 400 |
Debt interest rate (percent) | 2.85% |  | 2.85% |  |  |
Loans payable | 3.80% Notes due March 15, 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 918 |  |  |  | 1,100 |
Debt interest rate (percent) | 3.80% |  | 3.80% |  |  |
Loans payable | 0.90% Notes due December 3, 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 500 |  |  |  | 500 |
Debt interest rate (percent) | 0.90% |  |  |  |  | 0.90%
Loans payable | 1.30% Notes due August 15, 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 498 |  |  |  | 0 |
Debt interest rate (percent) | 1.30% | 1.30% |  |  |  |
Loans payable | 7.65% Debentures due March 1, 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 150 |  |  |  | 167 |
Debt interest rate (percent) | 7.65% |  | 7.65% |  |  |
Loans payable | 3.95% Notes due February 16, 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 343 |  |  |  | 600 |
Debt interest rate (percent) | 3.95% |  | 3.95% |  |  |
Loans payable | 4.75% Notes due May 30, 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 196 |  |  |  | 400 |
Debt interest rate (percent) | 4.75% |  | 4.75% |  |  |
Loans payable | 6.00% Notes due March 1, 2041 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 217 |  |  |  | 282 |
Debt interest rate (percent) | 6.00% |  | 6.00% |  |  |
Loans payable | 4.88% Notes due March 15, 2044 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 255 |  |  |  | 411 |
Debt interest rate (percent) | 4.88% |  | 4.88% |  |  |
Loans payable | 0.63% Euro Notes due August 17, 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 0 |  |  |  | 704 |
Debt interest rate (percent) | 0.63% |  |  | 0.63% |  |
Loans payable | 1.50% Euro Notes due November 17, 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 662 |  |  |  | 700 |
Debt interest rate (percent) | 1.50% |  |  |  |  |
Loans payable | 1.63% Euro Notes due October 30, 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 554 |  |  |  | 587 |
Debt interest rate (percent) | 1.63% |  |  |  |  |
Loans payable | 3.13% Sterling Notes due February 17, 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 582 |  |  |  | 627 |
Debt interest rate (percent) | 3.13% |  |  |  |  |
Lease and Other Obligations |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt outstanding | $ 244 |  |  |  | $ 270 |

X
- Definition Disposal Group, Including Discontinued Operation, Long-term Debt, Current Maturities + References No definition available. + Details
Name: | mck_DisposalGroupIncludingDiscontinuedOperationLongTermDebtCurrentMaturities
Namespace Prefix: | mck_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Disposal Group, Including Discontinued Operation, Long-term Debt, Excluding Current Maturities + References No definition available. + Details
Name: | mck_DisposalGroupIncludingDiscontinuedOperationLongTermDebtExcludingCurrentMaturities
Namespace Prefix: | mck_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt and lease obligation, classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt and lease obligation, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=mck_EuropeanBusinessesDisposalGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LoansPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A270NotesDueDecember152022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A285NotesDueMarch152023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A380NotesDueMarch152024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A090NotesDueDecember32025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A130NotesDueAugust152026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A765DebenturesDueMarch12027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A395NotesDueFebruary162028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A475NotesDueMay302029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A600NotesDueMarch12041Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A488NotesDueMarch152044Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A063EuroNotesDueAugust172021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A150EuroNotesDueNovember172025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A163EuroNotesDueOctober302026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mck_A313SterlingNotesDueFebruary172029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=mck_LeaseandOtherObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |