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SHARE-BASED COMPENSATION | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
SHARE-BASED COMPENSATION | For the three months ended June 30, 2019, the Company incurred share-based compensation costs of $13 million (2018: $14 million) related to share-settled restricted stock units and cash-settled restricted stock units. In addition, the Company recorded associated tax benefits of $2 million (2018: $3 million). For the six months ended June 30, 2019, the Company incurred share-based compensation costs of $29 million (2018: $29 million) and recorded associated tax benefits of $4 million (2018: $4 million). During the six months ended June 30, 2019, the fair value of share-settled restricted stock units and cash-settled restricted stock units that vested was $49 million (2018: $47 million). At June 30, 2019, there was $105 million of unrecognized share-based compensation costs (2018: $121 million) which are expected to be recognized over the weighted average period of 2.7 years (2018: 2.8 years). Share-Settled Awards The following table provides an activity summary of the Company's share-settled restricted stock units for the six months ended June 30, 2019:
|  | Share-Settled Performance Vesting Restricted Stock Units |  | Share-Settled Service Based Restricted Stock Units |
|  | Number of restricted stock units |  | Weighted average grant date fair value(1) |  | Number of restricted stock units |  | Weighted average grant date fair value(1) |
| Nonvested restricted stock units - beginning of period | 232 |  |  | $ | 54.54 |  |  | 1,411 |  |  | $ | 54.12 |  |
| Granted | 127 |  |  | 54.70 |  |  | 512 |  |  | 54.70 |  |
| Vested | (61 | ) |  | 53.82 |  |  | (463 | ) |  | 54.20 |  |
| Forfeited | — |  |  | — |  |  | (126 | ) |  | 54.57 |  |
| Nonvested restricted stock units - end of period | 298 |  |  | $ | 54.76 |  |  | 1,334 |  |  | $ | 54.27 |  |
(1) Fair value is based on the closing price of the Company's common shares on the grant date. Cash-Settled awards The following table provides an activity summary of the Company's cash-settled restricted stock units for the six months ended June 30, 2019:
|  | Cash-Settled Performance Vesting Restricted Stock Units |  | Cash-Settled Service Based Restricted Stock Units |
|  | Number of restricted stock units |  | Number of restricted stock units |
| Nonvested restricted stock units - beginning of period | 27 |  |  | 932 |  |
| Granted | — |  |  | 354 |  |
| Vested | (12 | ) |  | (327 | ) |
| Forfeited | — |  |  | (62 | ) |
| Nonvested restricted stock units - end of period | 15 |  |  | 897 |  |
At June 30, 2019, the liability for cash-settled restricted stock units, included in other liabilities in the consolidated balance sheets, was $13 million (2018: $13 million).

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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- References No definition available. + Details
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