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ACCUMULATED OTHER COMPREHENSIVE LOSS
 9 Months Ended
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
ACCUMULATED OTHER COMPREHENSIVE LOSS
ACCUMULATED OTHER COMPREHENSIVE LOSS
The following table summarizes the changes and after-tax balances of each component of accumulated other comprehensive loss ("AOCL") for the nine months ended September 30, 2018 and 2017:

Accumulated Other Comprehensive Loss
Cumulative Translation Adj
Pension and Other Postretire Benefits
Total Accum Other Comp Loss
In millions
Balance at Jan 1, 2017
$
(62
)
$
(1,258
)
$
(1,320
)
Other comprehensive income before reclassifications
1

—

1

Amounts reclassified from accumulated other comprehensive loss
3

36

39

Net other comprehensive income
$
4

$
36

$
40

Balance at Sep 30, 2017
$
(58
)
$
(1,222
)
$
(1,280
)
 
 
 
 
Balance at Jan 1, 2018
$
(59
)
$
(1,293
)
$
(1,352
)
Other comprehensive income before reclassifications
2

—

2

Amounts reclassified from accumulated other comprehensive loss
—

49

49

Net other comprehensive income
$
2

$
49

$
51

Reclassification of stranded tax effects 1
—

(254
)
(254
)
Balance at Sep 30, 2018
$
(57
)
$
(1,498
)
$
(1,555
)

1.
Amounts reclassified to retained earnings as a result of the adoption of ASU 2018-02. See Notes 1 and 2 for additional information.

The tax effects on the net activity related to each component of other comprehensive loss for the three and nine months ended September 30, 2018 and 2017 were as follows:

Tax Expense 1
Three Months Ended
Nine Months Ended
In millions
Sep 30, 2018
Sep 30, 2017
Sep 30, 2018
Sep 30, 2017
Pension and other postretirement benefit plans
$
(5
)
$
(6
)
$
(15
)
$
(22
)

1.
Prior period amounts were updated to conform with the current year presentation.

A summary of the reclassifications out of AOCL for the three and nine months ended September 30, 2018 and 2017 is provided as follows:

Reclassifications Out of Accumulated Other Comprehensive Loss
Three Months Ended
Nine Months Ended
Consolidated Statements of Income Classification
Sep 30, 2018
Sep 30, 2017
Sep 30, 2018
Sep 30, 2017
In millions
Cumulative translation adjustments
$
—

$
—

$
—

$
3

See (1) below
Pension and other postretirement benefit plans
$
21

$
18

$
64

$
58

See (2) below
Tax benefit
$
(5
)
$
(6
)
$
(15
)
$
(22
)
See (3) below
After tax
$
16

$
12

$
49

$
36

 
Total reclassifications for the period, after tax
$
16

$
12

$
49

$
39

 
1.
"Sundry income (expense) - net."
2.
These AOCL components are included in the computation of net periodic benefit cost of the Corporation's defined benefit pension and other postretirement benefit plans. See Note 10 for additional information.
3.
"Provision for income taxes."