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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Accumulated Other Comprehensive (Loss) Income Activity
The following table details the accumulated other comprehensive loss activity for 2018, 2017, and 2016:
($ in millions)
Foreign Currency Translation Adjustments
 
Derivative Instrument Adjustments
 
Available-For-Sale Securities Unrealized Adjustments
 
Pension and Postretirement Adjustments
 
Accumulated Other Comprehensive Loss
Balance at year-end 2015
$
(192
)
 
$
(8
)
 
$
4

 
$
—

 
$
(196
)
Other comprehensive (loss) income before reclassifications (1)
(311
)
 
1

 
2

 
5

 
(303
)
Reclassification of losses
—

 
2

 
—

 
—

 
2

Net other comprehensive (loss) income
(311
)
 
3

 
2

 
5

 
(301
)
Balance at year-end 2016
$
(503
)
 
$
(5
)
 
$
6

 
$
5

 
$
(497
)
Other comprehensive income (loss) before reclassifications (1)
478

 
(14
)
 
(2
)
 
7

 
469

Reclassification of losses
2

 
9

 
—

 
—

 
11

Net other comprehensive income (loss)
480

 
(5
)
 
(2
)
 
7

 
480

Balance at year-end 2017
$
(23
)
 
$
(10
)
 
$
4

 
$
12

 
$
(17
)
Other comprehensive (loss) income before reclassifications (1)
(391
)
 
12

 
—

 
(8
)
 
(387
)
Reclassification of losses
11

 
6

 
—

 
—

 
17

Net other comprehensive (loss) income
(380
)
 
18

 
—

 
(8
)
 
(370
)
Adoption of ASU 2016-01
—

 
—

 
(4
)
 
—

 
(4
)
Balance at year-end 2018
$
(403
)
 
$
8

 
$
—

 
$
4

 
$
(391
)

(1) 
Other comprehensive (loss) income before reclassifications for foreign currency translation adjustments includes gains (losses) on intra-entity foreign currency transactions that are of a long-term investment nature of $14 million for 2018, $(147) million for 2017, and $69 million for 2016.