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Fiduciary Assets And Liabilities (Details) (USD $)			6 Months Ended
Fiduciary Assets And Liabilities (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Risk and Insurance Services [Member]	Jun. 30, 2012 Risk and Insurance Services [Member]	Jun. 30, 2013 Consulting [Member]	Jun. 30, 2012 Consulting [Member]
Interest on fiduciary funds			$ 14,000,000	$ 21,000,000	$ 2,000,000	$ 1,000,000
Net uncollected premiums and claims receivable and payable	9,600,000,000	9,100,000,000
Assets in trusts or funds for management or trustee fee					$ 16,000,000,000

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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