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SHARE-BASED COMPENSATION | 3 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
SHARE-BASED COMPENSATION | For the three months ended March 31, 2018, the Company incurred share-based compensation costs of $16 million (2017: $29 million) related to restricted stock awards, share-settled restricted stock units, and cash-settled restricted stock units and recorded associated tax benefits of $2 million (2017: $7 million). The fair value of share-settled restricted stock units and cash-settled restricted stock units that vested during the three months ended March 31, 2018 was $42 million (2017: $120 million, which included $44 million attributable to a grant of three year cliff vesting service-based awards made in 2014). At March 31, 2018 there were $137 million of unrecognized compensation costs (2017: $130 million), which are expected to be recognized over the weighted average period of 3.0 years. Share-settled Awards The following table provides a summary of nonvested share settled restricted stock units for the three months ended March 31, 2018:
|  | 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 | 230 |  |  | $ | 57.08 |  |  | 1,355 |  |  | $ | 57.09 |  |
| Granted | 104 |  |  | 48.89 |  |  | 711 |  |  | 49.07 |  |
| Vested | (51 | ) |  | 53.81 |  |  | (455 | ) |  | 54.44 |  |
| Forfeited | — |  |  | — |  |  | (20 | ) |  | 57.45 |  |
| Nonvested restricted stock units - end of period | 283 |  |  | $ | 54.68 |  |  | 1,591 |  |  | $ | 54.18 |  |
(1) Fair value is based on the closing price of our common shares on the grant approval date. Cash-settled awards The following table provides a summary of nonvested cash settled restricted stock units for the three months ended March 31, 2018:
|  | 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 | 42 |  |  | 988 |  |
| Granted | — |  |  | 449 |  |
| Vested | (12 | ) |  | (360 | ) |
| Forfeited | — |  |  | (20 | ) |
| Nonvested restricted stock units - end of period | 30 |  |  | 1,057 |  |
At March 31, 2018, the liability for cash-settled restricted stock units, included in other liabilities in the Consolidated Balance Sheets, was $9 million (2017: $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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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