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Stock Plans (Tables)
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of weighted average grant date fair value and compensation expense related to share-based awards
During the six months ended June 30, 2018 and 2017, shares granted to eligible employees and the grant date fair value per share related to PSU awards were as follows:
 
Number of Shares Granted
PSU Grant Date Fair Value Subject to TSR Performance Factor Per Share (a)
PSU Grant Date Fair Value Subject to Other Performance Factors Per Share (b)
2018
401,500

$
118.98

$
100.69

2017
393,460

$
128.72

$
98.29


(a) The grant date fair value of the PSU market based awards subject to the TSR performance factor was determined by using the Monte Carlo simulation model.
(b) The grant date fair value of the PSU awards subject to the other performance factors was determined by using the average of the high and low market price of PMI’s stock at the date of grant.

Compensation expense related to PSU awards was as follows:
 
Compensation Expense Related to PSU Awards
(in millions)
For the Six Months Ended June 30,
For the Three Months Ended June 30,
2018
$
30

$
9

2017
$
25

$
8

During the six months ended June 30, 2018 and 2017, shares granted to eligible employees and the weighted-average grant date
fair value per share related to RSU awards were as follows:
 
Number of
Shares
Granted
Weighted-Average Grant Date Fair Value Per RSU Award Granted
2018
1,257,380

$
100.70

2017
1,202,970

$
98.48


Compensation expense related to RSU awards was as follows:
 
Compensation Expense Related to RSU Awards
(in millions)
For the Six Months Ended June 30,
For the Three Months Ended June 30,
2018
$
63

$
25

2017
$
60

$
25