Restructuring	3 Months Ended
Mar. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring Aon Hewitt Restructuring Plan On October 14, 2010, the Company announced a global restructuring plan ("Aon Hewitt Plan") in connection with the acquisition of Hewitt. The Aon Hewitt Plan was intended to streamline operations across the combined Aon Hewitt organization. The Company incurred all remaining costs for the Aon Hewitt Plan and the plan was closed in the fourth quarter of 2013. For the three months ended March 31, 2014 no charges were taken under the Aon Hewitt Plan. For the three months ended March 31, 2013, $26 million of restructuring expenses were charged, of which $15 million and $11 million were in the HR Solutions segment and Risk Solutions segment, respectively. As of December 31, 2013, the remaining liabilities for the Company's restructuring plans were $166 million. During the three months ended March 31, 2014, the Company made cash payments of $40 million, partially offset by foreign exchange translation of $1 million, resulting in restructuring liabilities of $127 million as of March 31, 2014.

Restructuring

3 Months Ended

Mar. 31, 2014

Restructuring and Related Activities [Abstract]

Aon Hewitt Restructuring Plan

On October 14, 2010, the Company announced a global restructuring plan ("Aon Hewitt Plan") in connection with the acquisition of Hewitt. The Aon Hewitt Plan was intended to streamline operations across the combined Aon Hewitt organization. The Company incurred all remaining costs for the Aon Hewitt Plan and the plan was closed in the fourth quarter of 2013. For the three months ended March 31, 2014 no charges were taken under the Aon Hewitt Plan. For the three months ended March 31, 2013, $26 million of restructuring expenses were charged, of which $15 million and $11 million were in the HR Solutions segment and Risk Solutions segment, respectively.

As of December 31, 2013, the remaining liabilities for the Company's restructuring plans were $166 million. During the three months ended March 31, 2014, the Company made cash payments of $40 million, partially offset by foreign exchange translation of $1 million, resulting in restructuring liabilities of $127 million as of March 31, 2014.