XML 68 R57.htm IDEA: XBRL DOCUMENT
v3.20.4

Stockholders' Equity (Deficit) - Narrative (Details) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 29, 2020 $ / shares | Jul. 28, 2020 $ / shares | Dec. 31, 2020 USD ($) vote $ / shares shares | Sep. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2020 shares | Dec. 31, 2019 $ / shares | Dec. 31, 2020 USD ($) vote $ / shares | Dec. 31, 2019 $ / shares | Jan. 31, 2021 USD ($)
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Number of votes per share of common stock permitted on proposals presented to stockholders (vote) | vote |  |  | 1 |  |  |  | 1 |  |
Dividends declared per common share (in dollars per share) | $ / shares | $ 0.42 | $ 0.41 | $ 0.42 |  |  | $ 0.41 | $ 1.25 | $ 1.21 |
Average price of shares repurchased (in usd per share) | $ / shares |  |  |  | $ 151.23 |  |  |  |  |
Authorized amount available for future repurchases | $ |  |  | $ 1,000,000,000.0 |  |  |  | $ 1,000,000,000.0 |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Approved increase to the authorized share repurchase amount | $ |  |  |  |  |  |  |  |  | $ 2,000,000,000.0
Accelerated Share Repurchase |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Common stock repurchased (in shares) | shares |  |  |  |  | 0 |  |  |  |
Open Market Share Repurchase Transactions |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Common stock repurchased (in shares) | shares |  |  | 1,500,000 | 1,800,000 |  |  |  |  |
Shares repurchased | $ |  |  | $ 231,000,000 | $ 269,000,000 |  |  |  |  |
Average price of shares repurchased (in usd per share) | $ / shares |  |  | $ 151.12 |  |  |  |  |  |

X
- Definition Common Stock, Voting Rights, Number of Votes Per Common Share + References No definition available. + Details
Name: | mck_CommonStockVotingRightsNumberofVotesPerCommonShare
Namespace Prefix: | mck_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Stock Repurchase Program, Additional Amount Authorized to be Repurchased + References No definition available. + Details
Name: | mck_StockRepurchaseProgramAdditionalAmountAuthorizedToBeRepurchased
Namespace Prefix: | mck_
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 Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount remaining of a stock repurchase plan authorized. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
Name: | us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix: | us-gaap_
Data Type: | num: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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: 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(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + 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 par value method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
Name: | us-gaap_TreasuryStockValueAcquiredParValueMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=mck_AcceleratedShareRepurchaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareRepurchaseProgramAxis=mck_OpenMarketShareRepurchaseTransactionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |