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Share-Based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Share-Based Compensation Expense Recognized in Continuing Operations | The following table summarizes share-based compensation expense recognized in the Condensed Consolidated Statements of Income in Compensation and benefits (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Restricted share units (“RSUs”) | $ | 46 |  |  | $ | 43 |  |  | $ | 156 |  |  | $ | 145 |
Performance share awards (“PSAs”) | 36 |  |  | 21 |  |  | 136 |  |  | 54 |
Employee share purchase plans and other (1) | 48 |  |  | 3 |  |  | 54 |  |  | 8 |
Total share-based compensation expense | $ | 130 |  |  | $ | 67 |  |  | $ | 346 |  |  | $ | 207 |
(1) Includes expenses related to the Aon United Growth Ownership Plan.
Schedule of Restricted Share Unit Activity | The following table summarizes the status of the Company’s RSUs (shares in thousands, except fair value):
| Nine Months Ended September 30,
| 2021 |  | 2020
| Shares |  | Fair Value (1) |  | Shares |  | Fair Value (1)
Non-vested at beginning of period | 3,309 |  |  | $ | 163 |  |  | 3,634 |  |  | $ | 143 |
Granted | 1,164 |  |  | $ | 250 |  |  | 1,221 |  |  | $ | 185 |
Vested | (1,147) |  |  | $ | 151 |  |  | (1,316) |  |  | $ | 133 |
Forfeited | (166) |  |  | $ | 176 |  |  | (138) |  |  | $ | 152 |
Non-vested at end of period | 3,160 |  |  | $ | 199 |  |  | 3,401 |  |  | $ | 162 |
(1)Represents per share weighted average fair value of award at date of grant.
Schedule of Performance Share Awards | 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 nine months ended September 30, 2021 and the years ended December 31, 2020 and 2019, respectively (shares in thousands and dollars in millions, except fair value per share):
| September 30, 2021 |  | December 31, 2020 |  | December 31, 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 | 376 |  |  | 978 |  |  | 890 |
Unamortized expense, based on current performance levels | $ | 70 |  |  | $ | 65 |  |  | $ | 11 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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