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Stock Plans and Share-Based Compensation (Tables)
 12 Months Ended
Dec. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-Based Compensation and Related Income Tax Benefit
Total pre-tax expense associated with share-based compensation and its related income tax benefit is shown in the table below.

 
Fiscal Years
(Dollars in Millions)
2016
 
2015
 
2014
Share-Based Compensation Expense
 
 
 
 
 
Performance Units
$
17

 
$
(1
)
 
$
20

Restricted Stock Units and Awards
11

 
11

 
11

Stock Options
7

 
—

 
—

Stock Awards for Directors
2

 
2

 
2

Total Share-based Compensation Expense
$
37

 
$
12

 
$
33

Income Tax Benefit
$
14

 
$
4

 
$
13
Summary of Performance Unit Grant and Vesting Information
Performance unit grant and vesting information is summarized as follows:
 
Fiscal Years
 
2016
 
2015
 
2014
Weighted-average grant date fair value
$
24.17

 
$
35.45

 
$
28.13

Fair value of units vested in fiscal year ending (in millions)
$
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 25, 2015
1,941

 
$
31.73

Granted
852

 
24.17

Forfeited
(118
)
 
29.22

Vested
(1,094
)
 
28.60

Unvested at December 30, 2016
1,581

 
$
30.00
Summary of Restricted Stock Grant and Vesting Information
Restricted stock grant and vesting information is summarized as follows:

 
Fiscal Years
 
2016
 
2015
 
2014
Weighted-average grant date fair value
$
24.21

 
$
35.94

 
$
28.08

Fair value of units and awards vested during fiscal year ended (in millions)
$
14

 
$
9

 
$
11
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 25, 2015
1,157

 
$
28.66

Granted
509

 
24.21

Forfeited
(52
)
 
28.19

Vested
(538
)
 
25.44

Unvested at December 30, 2016
1,076

 
$
28.19
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
 
2016
 
2015
Weighted-average grant date fair value
$
4.68

 
$
5.31

 
 
 
 
Stock options valuation assumptions:
 
 
 
Annual dividend yield
3
%
 
3
%
Risk-free interest rate
1
%
 
2
%
Annualized volatility
27
%
 
28
%
Expected life (in years)
6.5

 
6.5

Other pricing model inputs:
 
 
 
Weighted-average grant-date market price of CSX stock (strike price)
$
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 25, 2015
2,514

 
$
24.99

Granted
2,383

 
24.13

Forfeited
(316
)
 
24.63

Outstanding
4,582

 
$
24.57

Exercisable at December 30, 2016
—

 
—