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Share-Based Compensation | 6 Months Ended
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Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments | Share-Based Compensation Share-Based Compensation Plans We maintain stock incentive plans (collectively, the “Plans”) for the benefit of certain of our officers, directors and employees. The following tables provide total share-based compensation expense by type of award:
| Three Months Ended December 31
(in millions) | 2013 |  | 2012
Restricted share unit expense | $ | 15 |  |  | $ | 14 |
Employee stock option expense | 5 |  |  | 5 |
Performance share unit expense | 4 |  |  | 3 |
Total share-based compensation | $ | 24 |  |  | $ | 22 |
| Six Months Ended December 31
(in millions) | 2013 |  | 2012
Restricted share unit expense | $ | 31 |  |  | $ | 29 |
Employee stock option expense | 10 |  |  | 12 |
Performance share unit expense | 7 |  |  | 5 |
Total share-based compensation | $ | 48 |  |  | $ | 46 |
The total tax benefit related to share-based compensation was $8 million for both the three months ended December 31, 2013 and 2012, respectively, and $17 million and $16 million for the six months ended December 31, 2013 and 2012, respectively. Stock Options Employee stock options granted under the Plans generally vest in equal annual installments over three years and are exercisable for periods ranging from seven to ten years from the grant date. All stock options are exercisable at a price equal to the market value of the common shares underlying the option on the grant date and, when exercised, are issued out of treasury shares. The following table summarizes all stock option transactions under the Plans:
(in millions, except per share amounts) | Stock Options |  | Weighted-Average Exercise Price per Common Share
Outstanding at June 30, 2013 | 15 |  |  | $ | 36.97 |
Granted | 2 |  |  | 51.77 |
Exercised | (4 | ) |  | 39.82 |
Canceled and forfeited | — |  |  | — |
Outstanding at December 31, 2013 | 13 |  |  | $ | 38.45 |
Exercisable at December 31, 2013 | 8 |  |  | $ | 34.31 |
At December 31, 2013, the total pre-tax compensation cost, net of estimated forfeitures, related to nonvested stock options not yet recognized was $33 million, which is expected to be recognized over a weighted-average period of two years. The following table provides additional data related to stock option activity at:
(in millions, except contractual lives) | December 31, 2013 |  | June 30, 2013
Aggregate intrinsic value of outstanding options at period end | $ | 356 |  |  | $ | 156 |
Aggregate intrinsic value of exercisable options at period end | $ | 262 |  |  | $ | 113 |
Weighted-average remaining contractual life of outstanding options (in years) | 5 |  |  | 4 |
Weighted-average remaining contractual life of exercisable options (in years) | 3 |  |  | 3 |
Stock options are granted to our officers and certain employees. The fair values were estimated on the grant date using a lattice valuation model. We believe the lattice model provides reasonable estimates because it has the ability to take into account individual exercise patterns based on changes in our stock price and other variables, and it provides for a range of input assumptions. Restricted Share Units Restricted share units granted under the Plans generally vest in equal annual installments over three years. The fair value is determined by the grant date market price of our common shares. Restricted share units accrue cash dividend equivalents that are payable upon vesting of the awards. The following table summarizes all transactions related to restricted share units under the Plans:
(in millions, except per share amounts) | Restricted Share Units |  | Weighted-Average Grant Date Fair Value per Share
Nonvested at June 30, 2013 | 3 |  |  | $ | 38.74 |
Granted | 1 |  |  | 51.96 |
Vested | (1 | ) |  | 37.41 |
Canceled and forfeited | — |  |  | — |
Nonvested at December 31, 2013 | 3 |  |  | $ | 45.20 |
At December 31, 2013, the total pre-tax compensation cost, net of estimated forfeitures, related to nonvested restricted share units not yet recognized was $102 million, which is expected to be recognized over a weighted-average period of two years. Performance Share Units Performance share units vest over a three-year performance period based on achievement of specific performance goals. Based on the extent to which the targets are achieved, vested shares may range from zero to 200 percent of the target award amount. The fair value of performance share units is determined by the grant date market price of our common shares. The compensation expense associated with nonvested performance share units is dependent on our periodic assessment of the probability of the targets being achieved and our estimate of the number of shares that will ultimately be issued. Performance share units accrue cash dividend equivalents that are payable upon vesting of the awards. During the six months ended December 31, 2013, 274 thousand performance share units were granted at target at a weighted-average fair value per share of $51.49. Also during the six months ended December 31, 2013, 157 thousand performance share units with an initial two-year performance period and a weighted-average grant date fair value per share of $41.60 vested based on achievement of 143 percent of the target performance goal. At December 31, 2013, there were 868 thousand nonvested performance share units with a weighted-average grant date fair value per share of $44.39. At December 31, 2013, the total pre-tax compensation cost, net of estimated forfeitures, related to nonvested performance share units not yet recognized was $21 million, which is expected to be recognized over a weighted-average period of two years.

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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 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: 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=6406099&loc=d3e25284-112666 Reference 4: 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=6418621&loc=d3e17540-113929 Reference 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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