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Restructuring Aon Hewitt Restructuring Plan Narrative (Details) (Aon Hewitt Restructuring Plan [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Oct. 14, 2010	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Completed Plan Total	$ 429
Restructuring and related charges		174
Workforce reduction [Member]
Restructuring Cost and Reserve [Line Items]
Number of jobs eliminated to date under the plan	2,960
Completed Plan Total	266
Real estate lease rationalization [Member]
Restructuring Cost and Reserve [Line Items]
Completed Plan Total	$ 163

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details