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Stock Plans and Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-Based Compensation and Related Income Tax Benefit
The year over year increase in expense related to performance units and stock options is primarily due to modifications to the terms of awards (see Equity Award Modifications below) and higher expected award payouts.
 
Fiscal Years
(Dollars in Millions)
2017
 
2016
 
2015
Share-Based Compensation Expense
 
 
 
 
 
Performance Units
$
49

 
$
17

 
$
(1
)
Restricted Stock Units and Awards
15

 
11

 
11

Stock Options
22

 
7

 
—

Stock Awards for Directors
3

 
2

 
2

Total Share-based Compensation Expense
$
89

 
$
37

 
$
12

Income Tax Benefit
$
34

 
$
14

 
$
4
Summary of Performance Unit Grant and Vesting Information
Performance unit grant and vesting information is summarized as follows:
 
Fiscal Years
 
2017
 
2016
 
2015
Weighted-average grant date fair value
$
49.50

 
$
24.17

 
$
35.45

Fair value of units vested in fiscal year ending (in millions)
$
26

 
$
31

 
$
34
Performance Unit Activity Related to Outstanding Long-term Incentive Plans and Corresponding Fair Value
The performance unit activity related to the outstanding long-term incentive plans and corresponding fair value is summarized as follows:
 
Performance Units Outstanding
(in Thousands)
 
Weighted-Average Fair Value at Grant Date
Unvested at December 30, 2016
1,581

 
$
30.00

Granted
644

 
49.50

Forfeited
(530
)
 
38.47

Vested
(719
)
 
35.94

Unvested at December 31, 2017
976

 
$
33.90
Summary of Restricted Stock Grant and Vesting Information
Restricted stock grant and vesting information is summarized as follows:

 
Fiscal Years
 
2017
 
2016
 
2015
Weighted-average grant date fair value
$
48.35

 
$
24.21

 
$
35.94

Fair value of units and awards vested during fiscal year ended (in millions)
$
8

 
$
14

 
$
9
Schedule of Outstanding Restricted Stock Units and Awards
The restricted stock activity related to the outstanding long-term incentive plans and corresponding fair value is summarized as follows:
 
Restricted Stock Units and Awards Outstanding
(in Thousands)
 
Weighted-Average Fair Value at Grant Date
Unvested at December 30, 2016
1,076

 
$
28.19

Granted
328

 
48.35

Forfeited
(297
)
 
36.48

Vested
(300
)
 
28.09

Unvested at December 31, 2017
807

 
$
33.37
Summary of Assumptions and Inputs Used to Estimate Fair Value of Stock Options
Assumptions and inputs used to estimate fair value of stock options are summarized as follows:
 
Fiscal Years
 
2017
 
2016
 
2015
Weighted-average grant date fair value
$
12.84

 
$
4.68

 
$
5.31

 
 
 
 
 
 
Stock options valuation assumptions:
 
 
 
 
 
Annual dividend yield
1.5
%
 
3
%
 
3
%
Risk-free interest rate
2.2
%
 
1
%
 
2
%
Annualized volatility
27.1
%
 
27
%
 
28
%
Expected life (in years)
6.3

 
6.5

 
6.5

Other pricing model inputs:
 
 
 
 
 
Weighted-average grant-date market price of CSX stock (strike price)
$
49.63

 
$
24.13

 
$
24.99
Summary of Stock Option Activity
The stock option activity is summarized as follows:
 
Stock Options Outstanding
(in Thousands)
 
Weighted-Average Exercise Price
Outstanding at December 30, 2016
4,582

 
$
24.57

Granted
10,462

 
49.63

Forfeited
(10,860
)
 
46.81

Exercised
22

 
25.18

Outstanding at December 31, 2017
4,163

 
$
29.52

Exercisable at December 31, 2017
—

 
—