Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Share-based Compensation Expense Recognized in Continuing Operations

The following table summarizes share-based compensation expense recognized in the Consolidated Statements of Income in Compensation and benefits (in millions):

	Years Ended December 31
	2021		2020		2019
Restricted share units	$	204	$	186	$	198
Performance share awards	189		116		110
Employee share purchase plans and other (1)	56		10		9
Total share-based compensation expense	449		312		317
Tax benefit	87		61		66
Share-based compensation expense, net of tax	$	362	$	251	$	251

(1) Includes expenses related to the Aon United Growth Ownership Plan.

Restricted Share Unit Activity

The following table summarizes the status of the Company’s RSUs (shares in thousands, except fair value):

	Years Ended December 31
	2021			2020			2019
	Shares	Fair Value at Date of Grant (1)		Shares	Fair Value at Date of Grant (1)		Shares	Fair Value at Date of Grant (1)
Non-vested at beginning of year	3,309	$	163	3,634	$	143	4,208	$	120
Granted	1,257	$	253	1,329	$	185	1,306	$	175
Vested	(1,248)	$	151	(1,426)	$	133	(1,661)	$	113
Forfeited	(243)	$	184	(228)	$	157	(219)	$	131
Non-vested at end of year	3,075	$	203	3,309	$	163	3,634	$	143

(1)Represents per share weighted average fair value of award at date of grant.

Schedule of Performance-based Plans Information

The following table summarizes the Company’s target PSAs granted and shares that would be issued at current performance levels for PSAs granted during the years ended December 31, 2021, 2020, and 2019, respectively (shares in thousands and dollars in millions, except fair value):

	2021		2020		2019
Target PSAs granted during period	382		500		467
Weighted average fair value per share at date of grant	$	225	$	163	$	165
Number of shares that would be issued based on current performance levels	737		970		888
Unamortized expense, based on current performance levels	$	122	$	51	$	—