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Share-Based Compensation | 6 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | 16. Share-Based Compensation We maintain stock incentive plans (collectively, the “Plans”) for the benefit of certain of our officers, directors and employees. The following table provides total share-based compensation expense by type of award:
| Three Months Ended December 31,
(in millions) | 2017 |  | 2016
Restricted share unit expense | $ | 16 |  |  | $ | 17 |
Employee stock option expense | 5 |  |  | 5 |
Performance share unit expense | 2 |  |  | 2 |
Total share-based compensation | $ | 23 |  |  | $ | 24 |
| Six Months Ended December 31,
(in millions) | 2017 |  | 2016
Restricted share unit expense | $ | 34 |  |  | $ | 34 |
Employee stock option expense | 10 |  |  | 10 |
Performance share unit expense | (4 | ) |  | 3 |
Total share-based compensation | $ | 40 |  |  | $ | 47 |
The total tax benefit related to share-based compensation was $5 million and $8 million for the three months ended December 31, 2017 and 2016, respectively, and $11 million and $16 million for the six months ended December 31, 2017 and 2016, respectively. Restricted Share Units Restricted share units granted under the Plans generally vest in equal annual installments over three years. 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, 2017 | 2 |  |  | $ | 76.72 |
Granted | 1 |  |  | 66.10 |
Vested | (1 | ) |  | 79.80 |
Canceled and forfeited | — |  |  | — |
Nonvested at December 31, 2017 | 2 |  |  | $ | 67.92 |
At December 31, 2017, the total pre-tax compensation cost, net of estimated forfeitures, related to nonvested restricted share units not yet recognized was $107 million, which is expected to be recognized over a weighted-average period of two years. Stock Options Employee stock options granted under the Plans generally vest in equal annual installments over three years and are exercisable for 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. 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, 2017 | 6 |  |  | $ | 63.44 |
Granted | 2 |  |  | 66.44 |
Exercised | — |  |  | — |
Canceled and forfeited | — |  |  | — |
Outstanding at December 31, 2017 | 8 |  |  | $ | 64.28 |
Exercisable at December 31, 2017 | 5 |  |  | $ | 59.14 |
At December 31, 2017, the total pre-tax compensation cost, net of estimated forfeitures, related to nonvested stock options not yet recognized was $31 million, which is expected to be recognized over a weighted-average period of two years. The following tables provide additional detail related to stock options:
(in millions) | December 31, 2017 |  | June 30, 2017
Aggregate intrinsic value of outstanding options at period end | $ | 47 |  |  | $ | 109 |
Aggregate intrinsic value of exercisable options at period end | 47 |  |  | 106 |
(in years) | December 31, 2017 |  | June 30, 2017
Weighted-average remaining contractual life of outstanding options | 7 |  | 7
Weighted-average remaining contractual life of exercisable options | 6 |  | 6
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. Performance share units accrue cash dividend equivalents that are payable upon vesting of the awards. The following table summarizes all transactions related to performance share units under the Plans (based on target award amounts):
(in millions, except per share amounts) | Performance Share Units |  | Weighted-Average Grant Date Fair Value per Share
Nonvested at June 30, 2017 | 0.6 |  |  | $ | 77.83 |
Granted | 0.2 |  |  | 66.43 |
Vested (1) | (0.2 | ) |  | 71.57 |
Canceled and forfeited | — |  |  | — |
Nonvested at December 31, 2017 | 0.6 |  |  | $ | 75.14 |
(1) Vested based on achievement of 133 percent of the target performance goal. At December 31, 2017, the total pre-tax compensation cost, net of estimated forfeitures, related to nonvested performance share units not yet recognized was $16 million, which is expected to be recognized over a weighted-average period of two years if targets are achieved.

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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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