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Summary of Significant Accounting Policies Accounts Payable (Policies) | 12 Months Ended
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Dec. 31, 2014
Accounting Policies [Abstract] |
Accounts Payable | Accounts Payable Accounts payable includes all operating payables, including those related to all media and production costs. These payables are due within one year.

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- Definition Disclosure of accounting policy for accounts payable. + References No definition available. + Details
Name: | ipg_PayablesPolicyPolicyTextBlock
Namespace Prefix: | ipg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration