Exhibit 12.1

Aon plc and Consolidated Subsidiaries

Combined With Unconsolidated Subsidiaries

Computation of Ratio of Earnings to Fixed Charges

	Six Months Ended June 30,					Years Ended December 31,
(millions except ratio)	2016		2015			2015		2014		2013		2012
Income from continuing operations before income taxes and noncontrolling interests (1)	$	736	$	635		$	1,689	$	1,765	$	1,538	$	1,380
Less: Equity in earnings on less than 50% owned entities	3		6			13		12		20		13
Add back fixed charges:
Interest on indebtedness	142		133			273		255		210		228
Interest on uncertain tax positions	—		(2		)	—		4		5		5
Portion of rents representative of interest factor	17		22			45		50		52		42
Income as adjusted	$	892	$	782		$	1,994	$	2,062	$	1,785	$	1,642
Fixed charges:
Interest on indebtedness	$	142	$	133		$	273	$	255	$	210	$	228
Interest on uncertain tax positions	—		(2		)	—		4		5		5
Portion of rents representative of interest factor	17		22			45		50		52		42
Total fixed charges	$	159	$	153		$	318	$	309	$	267	$	275
Ratio of earnings to fixed charges	5.6		5.1			6.3		6.7		6.7		6.0

(1) For the year ended December 31, 2012, amounts related to discontinued operations have been included in Other income to conform to amounts included in the Consolidated Financial Statements. This amount in the year ended December 31, 2012 , which was historically included in Income (loss) from discontinued operations, has been reclassified to conform with current presentation. The amount reclassified was a $1 million loss for the year ended December 31, 2012 , from Income (loss) from discontinued operations to Other income.