Segment Information (Tables)

3 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Schedule of total revenue by business segments

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

	Three months ended March 31,
	2015			2014
Risk Solutions	$	1,895		$	1,994
HR Solutions	970			965
Intersegment eliminations	(18		)	(12		)
Total revenue	$	2,847		$	2,947

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,
	2015			2014
Retail brokerage	$	1,513		$	1,579
Reinsurance brokerage	377			409
Total Risk Solutions Segment	1,890			1,988
Consulting services	371			384
Outsourcing	604			589
Intrasegment	(5		)	(8		)
Total HR Solutions Segment	970			965
Intersegment	(18		)	(12		)
Total commissions, fees and other revenue	$	2,842		$	2,941

Schedule of fiduciary investment income by business segments

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

	Three months ended March 31,
	2015		2014
Risk Solutions	$	5	$	6
HR Solutions	—		—
Total fiduciary investment income	$	5	$	6

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,
	2015			2014
Risk Solutions	$	412		$	445
HR Solutions	76			67
Segment income before income taxes	488			512
Unallocated expenses	(47		)	(43		)
Interest income	3			2
Interest expense	(65		)	(58		)
Other income	42			1
Income before income taxes	$	421		$	414