Commitments and Contingencies	3 Months Ended
Mar. 31, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	13. Commitments and Contingencies Legal Proceedings and Contingencies In August 2018, a putative shareholder class action lawsuit was filed in the Southern District of New York, naming as defendants Nielsen, former Chief Executive Officer Dwight Mitchell Barns, and former Chief Financial Officer Jamere Jackson. Another lawsuit, which alleges similar facts but also names other defendants, including former Chief Operating Officer Stephen Hasker, was filed in the Northern District of Illinois in September 2018 and transferred to the Southern District of New York in December 2018. These lawsuits assert violations of certain provisions of the Securities Exchange Act of 1934, as amended, based on allegedly false and materially misleading statements relating to the outlook of Nielsen’s Buy (now “Connect”) segment, the Company’s preparedness for changes in global data privacy laws and Nielsen’s reliance on third-party data. The actions were consolidated on April 22, 2019, and the Public Employees’ Retirement System of Mississippi was appointed lead plaintiff for the putative class. Nielsen expects that an amended or consolidated complaint will be filed and intends to file a motion to dismiss the amended or consolidated complaint. In addition, in January 2019, a shareholder derivative lawsuit was filed in New York Supreme Court against a number of Nielsen’s current and former officers and directors. The derivative lawsuit alleges that the named officers and directors breached their fiduciary duties to Nielsen in connection with factual assertions substantially similar to those in the putative class action complaints. The derivative lawsuit further alleges that certain officers and directors engaged in trading Nielsen stock based on material, nonpublic information. Nielsen intends to defend these lawsuits vigorously. Based on currently available information, Nielsen believes that the Company has meritorious defenses to these actions and that their resolution is not likely to have a material adverse effect on Nielsen’s business, financial position, or results of operations. Nielsen is subject to litigation and other claims in the ordinary course of business, some of which include claims for substantial sums. Accruals have been recorded when the outcome is probable and can be reasonably estimated. While the ultimate results of claims and litigation cannot be determined, the Company does expect that the ultimate disposition of these matters will not have a material adverse effect on its operations or financial condition. However, depending on the amount and the timing, an unfavorable resolution of some or all of these matters could materially affect the Company’s future results of operations or cash flows in a particular period.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

13. Commitments and Contingencies

Legal Proceedings and Contingencies

In August 2018, a putative shareholder class action lawsuit was filed in the Southern District of New York, naming as defendants Nielsen, former Chief Executive Officer Dwight Mitchell Barns, and former Chief Financial Officer Jamere Jackson. Another lawsuit, which alleges similar facts but also names other defendants, including former Chief Operating Officer Stephen Hasker, was filed in the Northern District of Illinois in September 2018 and transferred to the Southern District of New York in December 2018. These lawsuits assert violations of certain provisions of the Securities Exchange Act of 1934, as amended, based on allegedly false and materially misleading statements relating to the outlook of Nielsen’s Buy (now “Connect”) segment, the Company’s preparedness for changes in global data privacy laws and Nielsen’s reliance on third-party data. The actions were consolidated on April 22, 2019, and the Public Employees’ Retirement System of Mississippi was appointed lead plaintiff for the putative class. Nielsen expects that an amended or consolidated complaint will be filed and intends to file a motion to dismiss the amended or consolidated complaint. In addition, in January 2019, a shareholder derivative lawsuit was filed in New York Supreme Court against a number of Nielsen’s current and former officers and directors. The derivative lawsuit alleges that the named officers and directors breached their fiduciary duties to Nielsen in connection with factual assertions substantially similar to those in the putative class action complaints. The derivative lawsuit further alleges that certain officers and directors engaged in trading Nielsen stock based on material, nonpublic information. Nielsen intends to defend these lawsuits vigorously. Based on currently available information, Nielsen believes that the Company has meritorious defenses to these actions and that their resolution is not likely to have a material adverse effect on Nielsen’s business, financial position, or results of operations.

Nielsen is subject to litigation and other claims in the ordinary course of business, some of which include claims for substantial sums. Accruals have been recorded when the outcome is probable and can be reasonably estimated. While the ultimate results of claims and litigation cannot be determined, the Company does expect that the ultimate disposition of these matters will not have a material adverse effect on its operations or financial condition. However, depending on the amount and the timing, an unfavorable resolution of some or all of these matters could materially affect the Company’s future results of operations or cash flows in a particular period.