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Debt - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Mar. 31, 2022
--- | --- | ---
Senior unsecured revolving loan facility |  |
Debt Instrument [Line Items] |  |
Additional borrowing capacity | $ 1,100 |
Undrawn letters of credit | 1 |
Senior unsecured revolving loan facility | Accounts Payable, Inventory Financing |  |
Debt Instrument [Line Items] |  |
Amount owed under Revolving loan financing agreement | $ 348 |
Senior unsecured term loan facility |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Annual Principal Payment |  | $ 36
2023 and thereafter |  | $ 18

X
- Definition Amount owed under Revolving loan financing agreement + References No definition available. + Details
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Namespace Prefix: | cdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Long Term Debt Maturities Repayments Of Principal Year Two And Thereafter + References No definition available. + Details
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Namespace Prefix: | cdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of the total principal payments made during the annual reporting period. + 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 https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | debit
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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |