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SHARE-BASED COMPENSATION | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
SHARE-BASED COMPENSATION | For the three months ended June 30, 2017, the Company incurred share-based compensation costs of $16 million (2016: $19 million) related to restricted stock awards, share-settled restricted stock units, and cash-settled restricted stock units and recorded associated tax benefits of $3.5 million (2016: $5 million). For the six months ended June 30, 2017, the Company incurred share-based compensation costs of $44 million (2016: $36 million). In addition, the Company recorded associated tax benefits of $17 million (2016: $8 million), including $7 million related to excess tax benefits associated with the vesting of restricted stock units. The fair value of share-settled restricted stock units and cash-settled restricted stock units that vested during the six months ended June 30, 2017 was $124 million (2016: $62 million), including $44 million attributable to a 2014 grant of 3 year cliff vesting service-based awards. At June 30, 2017 there were $115 million of unrecognized compensation costs, which are expected to be recognized over the weighted average period of 2.7 years. Share-settled Awards The following table provides a reconciliation of the beginning and ending balance of nonvested share-settled restricted stock units for the six months ended June 30, 2017:
|  | Performance-based Stock Awards |  | Service-based Stock Awards |
|  | 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 - beginning of period | 283 |  |  | $ | 51.27 |  |  | 1,593 |  |  | $ | 48.88 |  |
| Granted | 87 |  |  | 64.58 |  |  | 521 |  |  | 64.23 |  |
| Vested(2) | (119 | ) |  | 49.14 |  |  | (876 | ) |  | 47.38 |  |
| Forfeited | — |  |  | — |  |  | (37 | ) |  | 54.89 |  |
| Nonvested restricted stock - end of period | 251 |  |  | $ | 56.88 |  |  | 1,201 |  |  | $ | 56.96 |  |
(1) Fair value is based on the closing price of our common shares on the grant approval date. (2) Share-settled restricted stock units vested during the six months ended June 30, 2017 included 313,391 restricted stock units attributable to a 2014 grant of 3 year cliff vesting service-based awards. Cash-settled awards The following table provides a reconciliation of the beginning and ending balance of nonvested cash-settled restricted stock units for the six months ended June 30, 2017:
|  | Performance-based Cash Settled Awards |  | Service-based Cash Settled Awards |
|  | Number of Restricted Stock Units |  | Number of Restricted Stock Units |
| Nonvested restricted stock units - beginning of period | 68 |  |  | 1,392 |  |
| Granted | 15 |  |  | 425 |  |
| Vested(1) | (38 | ) |  | (751 | ) |
| Forfeited | — |  |  | (37 | ) |
| Nonvested restricted stock units - end of period | 45 |  |  | 1,029 |  |
(1) Cash settled restricted stock units vested during the six months ended June 30, 2017 included 307,556 restricted stock units attributable to a 2014 grant of 3 year cliff vesting service-based awards. At June 30, 2017, the liability for cash-settled restricted stock units, included in other liabilities in the Consolidated Balance Sheets, was $14 million (2016: $30 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 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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