Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Shareholders' Equity

Schedule of shares of participating securities in earnings

 Income from continuing operations, income from discontinued operations and net income, attributable to participating securities, were as follows (in millions):

	Year ended December 31,
	2012		2011		2010
Income from continuing operations	$	11	$	13	$	15
Income from discontinued operations		—		—		—
Net income	$	11	$	13	$	15

Schedule of components of weighted average number of shares outstanding

 Weighted average shares outstanding are as follows (in millions):

	Year ended December 31,
	2012		2011		2010
Shares for basic earnings per share (1)		328.5		335.5		293.4
Potentially issuable ordinary shares		4.1		5.4		4.7
Shares for diluted earnings per share		332.6		340.9		298.1

(1)

Includes 4.7 million, 7.6 million and 6.1 million shares of participating securities for the years ended December 31, 2012, 2011, and 2010 respectively.

Components of other comprehensive income (loss) and the related tax effects

 The components of other comprehensive loss and the related tax effects are as follows (in millions):

Year ended December 31, 2012	Pretax			Income Tax Benefit (Expense)			Net of Tax
Net derivative losses arising during the year	$	(19	)	$	7		$	(12	)
Reclassification adjustment		33			(12	)		21
Net change in derivative losses		14			(5	)		9
Net foreign exchange translation adjustments		109			—			109
Net post-retirement benefit obligation		(488	)		130			(358	)
Total other comprehensive loss		(365	)		125			(240	)
Less: other comprehensive income attributable to noncontrolling interest		—			—			—
Other comprehensive loss attributable to Aon shareholders	$	(365	)	$	125		$	(240	)

Year ended December 31, 2011	Pretax			Income Tax Benefit (Expense)			Net of Tax
Net derivative losses arising during the year	$	(44	)	$	15		$	(29	)
Reclassification adjustment		25			(9	)		16
Net change in derivative losses		(19	)		6			(13	)
Net foreign exchange translation adjustments		(46	)		3			(43	)
Net post-retirement benefit obligation		(593	)		197			(396	)
Total other comprehensive loss		(658	)		206			(452	)
Less: other comprehensive income attributable to noncontrolling interest		1			—			1
Other comprehensive loss attributable to Aon shareholders	$	(659	)	$	206		$	(453	)

Year ended December 31, 2010	Pretax			Income Tax Benefit (Expense)			Net of Tax
Net derivative losses arising during the year	$	(31	)	$	10		$	(21	)
Reclassification adjustment		(5	)		2			(3	)
Net change in derivative losses		(36	)		12			(24	)
Net foreign exchange translation adjustments		(92	)		(43	)		(135	)
Net post-retirement benefit obligation		(76	)		35			(41	)
Total other comprehensive loss		(204	)		4			(200	)
Less: other comprehensive loss attributable to noncontrolling interests		(2	)		—			(2	)
Other comprehensive loss attributable to Aon shareholders	$	(202	)	$	4		$	(198	)

Components of Accumulated other comprehensive loss, net of related tax

   The components of accumulated other comprehensive loss, net of related tax, are as follows (in millions):

As of December 31	2012			2011			2010
Net derivative losses	$	(28	)	$	(37	)	$	(24	)
Net foreign exchange translation adjustments		233			124			168
Net postretirement benefit obligations		(2,815	)		(2,457	)		(2,061	)
Accumulated other comprehensive loss, net of tax	$	(2,610	)	$	(2,370	)	$	(1,917	)