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LEGAL PROCEEDINGS, COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2013
$
30

Reserve charges and adjustments, net
4

Payments
(5
)
Reserve balance as of December 31, 2014
$
29

Total active sites as of December 31, 2014
49
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, 2013
$
54

Reserve charges and adjustments, net
10

Payments
(10
)
Other adjustments(1)
(14
)
Reserve balance as of December 31, 2014
$
40

(1) Primarily related to the sale of a landfill in Washington State.
Our purchase obligations
Our purchase obligations as of December 31, 2014 were:
DOLLAR AMOUNTS IN MILLIONS
  
DECEMBER 31, 2014

2015
$
35

2016
$
16

2017
$
6

2018
$
6

2019
$
2

Thereafter
$
7
Our rent expense
Our rent expense was:
DOLLAR AMOUNTS IN MILLIONS
  
2014

2013

2012

Rent expense
$
32

$
38

$
36
Our operating lease commitments
Our operating lease commitments as of December 31, 2014 were:
DOLLAR AMOUNTS IN MILLIONS
  
DECEMBER 31, 2014

2015
$
28

2016
$
21

2017
$
20

2018
$
16

2019
$
12

Thereafter
$
107