Segment Information (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Schedule of total revenue by business segments

Aon’s total revenue is as follows (in millions):

	Three months ended March 31,
	2014			2013
Risk Solutions	$	1,994		$	1,971
HR Solutions	965			954
Intersegment eliminations	(12		)	(10		)
Total revenue	$	2,947		$	2,915

Schedule of commissions, fees and other revenues by products

Commissions, fees and other revenues by product are as follows (in millions):

	Three months ended March 31,
	2014			2013
Retail brokerage	$	1,579		$	1,562
Reinsurance brokerage	409			402
Total Risk Solutions Segment	1,988			1,964
Consulting services	384			382
Outsourcing	589			581
Intrasegment	(8		)	(9		)
Total HR Solutions Segment	965			954
Intersegment	(12		)	(10		)
Total commissions, fees and other revenue	$	2,941		$	2,908

Schedule of fiduciary investment income by business segments

Fiduciary investment income by segment is as follows (in millions):

	Three months ended March 31,
	2014		2013
Risk Solutions	$	6	$	7
HR Solutions	—		—
Total fiduciary investment income	$	6	$	7

Schedule of reconciliation of segment income before tax to income from continuing operations before income taxes

A reconciliation of segment operating income before tax to income before income taxes is as follows (in millions):

	Three months ended March 31,
	2014			2013
Risk Solutions	$	445		$	403
HR Solutions	67			51
Segment income before income taxes	512			454
Unallocated expenses	(43		)	(44		)
Interest income	2			1
Interest expense	(58		)	(52		)
Other income	1			9
Income before income taxes	$	414		$	368