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SHAREHOLDERS' INTEREST (Tables)
 12 Months Ended
Dec. 31, 2017
Reconciliation of Our Common Share Activity
Reconciliation of Our Common Share Activity
SHARES IN THOUSANDS
  
2017

2016

2015

Outstanding at beginning of year
748,528

510,483

524,474

Issuance from merger with Plum Creek (Note 4)
—

278,887

—

Stock options exercised
5,970

2,571

1,592

Issued for restricted stock units
605

840

365

Issued for performance shares
120

219

242

Preference shares converted to common
—

23,345

—

Repurchased
—

(67,817
)
(16,190
)
Outstanding at end of year
755,223

748,528

510,483
Changes in amounts included in our cumulative other comprehensive income (loss) by component
Changes in amounts included in our cumulative other comprehensive income (loss) by component are:
DOLLAR AMOUNTS IN MILLIONS
 
 
PENSION
OTHER POSTRETIREMENT BENEFITS
 
 
  
Foreign currency translation adjustments
Actuarial losses
Prior service costs
Actuarial losses
Prior service credits
Unrealized gains on available-for-sale securities
Total
Beginning balance as of January 1, 2016
$
207

$
(1,372
)
$
(11
)
$
(77
)
$
35

$
6

$
(1,212
)
Other comprehensive income (loss) before reclassifications
25

(590
)
—

5

—

1

(559
)
Income taxes
—

208

—

(1
)
—

—

207

Net other comprehensive income (loss) before reclassifications
25

(382
)
—

4

—

1

(352
)
Amounts reclassified from cumulative other comprehensive income (loss)(1)
—

156

4

9

(7
)
—

162

Income taxes
—

(53
)
(2
)
(3
)
1

—

(57
)
Net amounts reclassified from cumulative other comprehensive income (loss)
—

103

2

6

(6
)
—

105

Total other comprehensive income (loss)
25

(279
)
2

10

(6
)
1

(247
)
Beginning balance as of January 1, 2017
$
232

$
(1,651
)
$
(9
)
$
(67
)
$
29

$
7

$
(1,459
)
Other comprehensive income (loss) before reclassifications
32

(356
)
(3
)
19

—

2

(306
)
Income taxes
—

76

1

(5
)
—

—

72

Net other comprehensive income (loss) before reclassifications
32

(280
)
(2
)
14

—

2

(234
)
Amounts reclassified from cumulative other comprehensive income (loss)(1)
—

195

4

8

(8
)
—

199

Income taxes
—

(66
)
(1
)
(3
)
2

—

(68
)
Net amounts reclassified from cumulative other comprehensive income (loss)
—

129

3

5

(6
)
—

131

Total other comprehensive income (loss)
32

(151
)
1

19

(6
)
2

(103
)
Ending balance as of December 31, 2017
$
264

$
(1,802
)
$
(8
)
$
(48
)
$
23

$
9

$
(1,562
)
(1) Actuarial losses and prior service credits (costs) are included in the computation of net periodic benefit costs (credits). See Note: 9 Pension and Other Postretirement Benefit Plans.