Recent Accounting Standards Recent Accounting Standards (Details) $ in Billions	Dec. 31, 2018 USD ($)
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Minimum Estimate of Right of Use Asset and Liability for Operating Leases	$ 1.3
Maximum Estimate of Right of Use Asset and Liability for Operating Leases	$ 1.6

Minimum Estimate of Right of Use Asset and Liability for Operating Leases

No definition available.

Name:	ipg_MinimumEstimateofRightofUseAssetandLiabilityforOperatingLeases
Namespace Prefix:	ipg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant