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Other Comprehensive Income (Loss)
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss)

CSX reports comprehensive earnings or loss in accordance with the Comprehensive Income Topic in the ASC in the Consolidated Comprehensive Income Statement. Total comprehensive earnings are defined as all changes in shareholders' equity during a period, other than those resulting from investments by and distributions to shareholders (e.g. issuance of equity securities and dividends). Generally, for CSX, total comprehensive earnings equal net earnings plus or minus adjustments for pension and other post-retirement liabilities. Total comprehensive earnings represent the activity for a period net of tax and were $881 million and $575 million for second quarters and $1.5 billion and $943 million for six months 2018 and 2017, respectively.

While total comprehensive earnings is the activity in a period and is largely driven by net earnings in that period, accumulated other comprehensive income or loss (“AOCI”) represents the cumulative balance of other comprehensive income, net of tax, as of the balance sheet date. For CSX, AOCI is primarily the cumulative balance related to pension and other post-retirement benefit adjustments and CSX's share of AOCI of equity method investees.

Changes in the AOCI balance by component are shown in the table below. Amounts reclassified in pension and other post-employment benefits to net earnings relate to the amortization of actuarial losses and are included in labor and fringe on the consolidated income statements. See Note 6, Employee Benefit Plans, for further information. Other primarily represents CSX's share of AOCI of equity method investees. Amounts reclassified in other to net earnings are included in equity earnings of affiliates on the consolidated income statements.
 
Pension and Other Post-Employment Benefits
Other
Accumulated Other Comprehensive Income (Loss)
(Dollars in millions)
 
 
 
Balance December 31, 2017, Net of Tax
$
(440
)
$
(46
)
$
(486
)
Other Comprehensive Income (Loss)
 
 
 
Loss Before Reclassifications
—

(1
)
(1
)
Amounts Reclassified to Net Earnings
20

(3
)
17

Tax (Expense) Benefit
(5
)
1

(4
)
Reclassification of Stranded Tax Effects
(108
)
1

(107
)
Total Other Comprehensive Loss
(93
)
(2
)
(95
)
Balance June 30, 2018, Net of Tax
$
(533
)
$
(48
)
$
(581
)