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LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2015
Loss Contingencies [Line Items]  
Changes in the Reserve for Environmental Remediation
Changes in the Reserve for Environmental Remediation
DOLLAR AMOUNTS IN MILLIONS
Reserve balance as of December 31, 2014
$
29

Reserve charges and adjustments, net
15

Payments
(7
)
Reserve balance as of December 31, 2015
$
37

Total active sites as of December 31, 2015
38
Changes in the Reserve for Asset Retirement Obligations
Changes in the Reserve for Asset Retirement Obligations
DOLLAR AMOUNTS IN MILLIONS
Reserve balance as of December 31, 2014
$
40

Reserve charges and adjustments, net
10

Payments
(11
)
Other adjustments(1)
(5
)
Reserve balance as of December 31, 2015
34

(1) Primarily related to a foreign currency remeasurement gain for our Canadian reforestation obligation.
 
Our purchase obligations
Our purchase obligations as of December 31, 2015 were:
DOLLAR AMOUNTS IN MILLIONS
  
DECEMBER 31, 2015

2016
$
84

2017
$
33

2018
$
8

2019
$
2

2020
$
2

Thereafter
$
17
Our rent expense
Our rent expense was:
DOLLAR AMOUNTS IN MILLIONS
  
2015

2014

2013

Rent expense
$
31

$
32

$
38
Our operating lease commitments
Our operating lease commitments as of December 31, 2015 were:
DOLLAR AMOUNTS IN MILLIONS
  
DECEMBER 31, 2015

2016
$
27

2017
$
26

2018
$
21

2019
$
17

2020
$
14

Thereafter
$
105