XML 58 R47.htm IDEA: XBRL DOCUMENT v3.21.2

Debt and Financing Activities - Long-Term Debt Narrative (Details) € in Millions, $ in Millions	Jul. 23, 2021 USD ($)	Jul. 17, 2021 USD ($)	Jul. 17, 2021 EUR (€)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)
Debt Instrument [Line Items]
Long-term debt				$ 7,176	$ 7,148
Current portion of long-term debt				$ 752	$ 742
0.63% Euro Notes due August 17, 2021 | Term Loan
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)				0.63%
0.63% Euro Notes due August 17, 2021 | Term Loan | Subsequent Event
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)		0.63%	0.63%
Debt principal redeemed		$ 709	€ 600
2.85% Notes due March 15, 2023 | Term Loan
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)				2.85%
2.85% Notes due March 15, 2023 | Term Loan | Subsequent Event
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)	2.85%
3.80% Notes due March 15, 2024 | Term Loan
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)				3.80%
3.80% Notes due March 15, 2024 | Term Loan | Subsequent Event
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)	3.80%
7.65% Debentures due March 1, 2027 | Term Loan
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)				7.65%
7.65% Debentures due March 1, 2027 | Term Loan | Subsequent Event
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)	7.65%
3.95% Notes due February 16, 2028 | Term Loan
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)				3.95%
3.95% Notes due February 16, 2028 | Term Loan | Subsequent Event
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)	3.95%
4.75% Notes due May 30, 2029 | Term Loan
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)				4.75%
4.75% Notes due May 30, 2029 | Term Loan | Subsequent Event
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)	4.75%
6.00% Notes due March 1, 2041 | Term Loan
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)				6.00%
6.00% Notes due March 1, 2041 | Term Loan | Subsequent Event
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)	6.00%
4.88% Notes due March 15, 2044 | Term Loan
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)				4.88%
4.88% Notes due March 15, 2044 | Term Loan | Subsequent Event
Debt Instrument [Line Items]
Interest rate on debt instrument (percent)	4.88%
Tender Offer Notes | Term Loan | Subsequent Event
Debt Instrument [Line Items]
Debt principal redeemed	$ 922
Aggregate consideration of debt redeemed	$ 1,100
Redemption price percentage of principal (percent)	100.00%
Premiums	$ 182

X

- Definition

Amount of short-term and long-term debt and lease obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
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

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

- Definition

Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfDebtExtinguishmentCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_DebtInstrumentAxis=mck_A063EuroNotesDueAugust172021Member
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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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_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_TenderOfferNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: