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SHARE-BASED COMPENSATION | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
SHARE-BASED COMPENSATION | For the three months ended March 31, 2019, the Company incurred share-based compensation costs of $15 million (2018: $16 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: $2 million). During the three months ended March 31, 2019, the fair value of share-settled restricted stock units and cash-settled restricted stock units that vested was $48 million (2018: $42 million). At March 31, 2019 there was $121 million of unrecognized share-based compensation costs (2018: $137 million) which are expected to be recognized over the weighted average period of 2.9 years (2018 3.0 years). Share-Settled Awards The following table provides an activity summary of the Company's share-settled restricted stock units for the three months ended March 31, 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 |  |  | 508 |  |  | 54.67 |  |
| Vested | (61 | ) |  | 53.82 |  |  | (445 | ) |  | 54.04 |  |
| Forfeited | — |  |  | — |  |  | (74 | ) |  | 54.84 |  |
| Nonvested restricted stock units - end of period | 298 |  |  | $ | 54.76 |  |  | 1,400 |  |  | $ | 54.31 |  |
(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 three months ended March 31, 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 | — |  |  | 349 |  |
| Vested | (12 | ) |  | (320 | ) |
| Forfeited | — |  |  | (35 | ) |
| Nonvested restricted stock units - end of period | 15 |  |  | 926 |  |
At March 31, 2019, the liability for cash-settled restricted stock units, included in other liabilities in the consolidated balance sheet, was $8 million (2018: $9 million).

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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