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Integration and Restructuring Costs (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring actions costs	$ 12us-gaap_RestructuringCharges	$ 22us-gaap_RestructuringCharges	$ 78us-gaap_RestructuringCharges
Liability balance	92us-gaap_RestructuringReserve	124us-gaap_RestructuringReserve	170us-gaap_RestructuringReserve	181us-gaap_RestructuringReserve
Payments for restructuring	43us-gaap_PaymentsForRestructuring	65us-gaap_PaymentsForRestructuring	88us-gaap_PaymentsForRestructuring
Risk and Insurance Services Segment [Member] \| Acquisition Related [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring actions costs	5
Consulting Segment [Member] \| Acquisition Related [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring actions costs	1
Corporate Segment [Member] \| Acquisition Related [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring actions costs	$ 6

- 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