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SHARE-BASED COMPENSATION
 6 Months Ended
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).