Consolidated Statements of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenue
Commissions, fees and other	$ 11,787		$ 11,476		$ 11,235
Fiduciary investment income	28		38		52
Total revenue	11,815		11,514		11,287
Expenses
Compensation and benefits	6,945		6,709		6,567
Other general expenses	3,199		3,209		3,124
Total operating expenses	10,144		9,918		9,691
Operating income	1,671		1,596		1,596
Interest income	9		10		18
Interest expense	(210)		(228)		(245)
Other income	68		2		19
Income before income taxes	1,538		1,380		1,388
Income taxes	390		360		378
Net income	1,148		1,020		1,010
Less: Net income attributable to noncontrolling interests	35		27		31
Net income attributable to Aon shareholders	$ 1,113		$ 993		$ 979
Basic net income per share attributable to Aon shareholders (in dollars per share)	$ 3.57		$ 3.02		$ 2.92
Diluted net income per share attributable to Aon shareholders (in dollars per share)	$ 3.53		$ 2.99		$ 2.87
Cash dividends per share paid on ordinary shares (in dollars per share)	$ 0.68		$ 0.62		$ 0.60
Weighted average ordinary shares outstanding - basic (in shares)	311.4	[1]	328.5	[1]	335.5	[1]
Weighted average ordinary shares outstanding - diluted (in shares)	315.4		332.6		340.9

[1] Includes 3.9 million, 4.7 million and 7.6 million shares of participating securities for the years ended December 31, 2013, 2012, and 2011 respectively.