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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Data
Pursuant to Article 3 of the SEC’s Regulation S-X, the following are selected quarterly financial data:

Fiscal Year Ended December 2018 (a)
Quarters
(Dollars in Millions, Except Per Share Amounts)
1st
 
2nd
 
3rd
 
4th
 
Full Year
Revenue
$
2,876

 
$
3,102

 
$
3,129

 
$
3,143

 
$
12,250

Operating Income
1,044

 
1,283

 
1,293

 
1,249

 
4,869

Net Earnings
695

 
877

 
894

 
843

 
3,309

 
 
 
 
 
 
 
 
 
 
Earnings Per Share, Basic
$
0.78

 
$
1.02

 
$
1.05

 
$
1.02

 
$
3.86

Earnings Per Share, Assuming Dilution
0.78

 
1.01

 
1.05

 
1.01

 
3.84

 
 
 
 
 
 
 
 
 
 
Fiscal Year Ended December 2017 (a)
 
 
 
 
 
 
 
 
 
Revenue
$
2,869

 
$
2,933

 
$
2,743

 
$
2,863

 
$
11,408

Operating Income (c)
769

 
957

 
868

 
1,126

 
3,720

Net Earnings (b)
362

 
510

 
459

 
4,140

 
5,471

 
 
 
 
 
 
 
 
 
 
Earnings Per Share, Basic (b)
$
0.39

 
$
0.55

 
$
0.51

 
$
4.63

 
$
6.01

Earnings Per Share, Assuming Dilution (b)
0.39

 
0.55

 
0.51

 
4.62

 
5.99


(a) Prior to third quarter 2017, CSX followed a 52/53 week fiscal reporting calendar and 2017 included 366 days. See Note 1, Nature of Operations and Significant Accounting Policies for details regarding the number of days in each quarterly period presented.
(b) These results for fourth quarter and full year 2017 include a $3.6 billion, or $3.91 per share, net tax reform benefit. See further discussion in Note 11, Income Taxes.
(c) Certain prior year data has been reclassified to conform to the current presentation. See further discussion of reclassification of all components of net periodic benefit cost except service cost from labor and fringe expense to other income - net in Note 1.