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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)
 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Qualified and Registered Pension Plans
Dec. 31, 2011
Pension
Dec. 31, 2012
Pension
Dec. 31, 2010
Pension
Dec. 31, 2012
Non Registered Canadian Pension Plans
Dec. 31, 2012
United States
Qualified and Registered Pension Plans
Dec. 31, 2011
United States
Other Postretirement Benefits
Sep. 30, 2010
United States
Other Postretirement Benefits
Dec. 31, 2012
Derivatives
Qualified and Registered Pension Plans
Dec. 31, 2012
Derivatives, Aggregate Notional Amount
Qualified and Registered Pension Plans
Types Of Plans We Sponsor The plans we sponsor in the U.S. and Canada differ according to each country’s requirements.In the U.S., our pension plans are:•qualified — plans that qualify under the Internal Revenue Code; and•nonqualified — plans for select employees that provide additional benefits not qualified under the Internal Revenue Code.In Canada, our pension plans are:•registered — plans that are registered under the Income Tax Act and applicable provincial pension acts; and•nonregistered — plans for select employees that provide additional benefits that may not be registered under the Income Tax Act or provincial pension acts.We also offer retiree medical and life insurance plans in the U.S. and Canada. These plans are referred to as other postretirement benefit plans in the following disclosures.                        
Benefit Plan Amendment         During fourth quarter 2011, we ratified an amendment to the Weyerhaeuser Pension Plan that eliminated the Retiree Medical Enhancement for active employees effective July 1, 2012. This change reduced the Plan's projected benefit obligation by $16 million. This change was announced to affected participants in January 2012. During 2012 we ratified amendments to the Weyerhaeuser Pension Plan for various collectively bargained benefits. These changes increased the projected benefit obligation by $12 million. Effective December 31, 2010, the Weyerhaeuser Company Retirement Plan for Hourly Rated Employees was merged into the Weyerhaeuser Company Retirement Plan for Salaried Employees resulting in the Weyerhaeuser Pension Plan. There were no changes to the provisions as a result of the plan merger.     During fourth quarter 2011, we ratified amendments to our postretirement medical and life insurance benefit plans for U.S. salaried employees that reduced or eliminated certain medical and life insurance benefits that were available to both past and present employees. The changes included the elimination of the Pre-Medicare Plan II company subsidy for those not enrolled as of July 1, 2012, and eliminated the Post-Medicare Health Reimbursement Account (HRA) for those not enrolled or Medicare eligible, if enrolled, as of July 1, 2012. These changes resulted in a $108 million reduction in the company's postretirement liability as of December 31, 2011. These changes were announced to affected participants in January 2012. During third quarter 2010, we made changes to our postretirement medical plan for certain retirees in the U.S. Specifically, Medicare eligible retirees will be covered by a Health Reimbursement Account (HRA) as of January 1, 2011. The HRA will allow these retirees to purchase coverage through a healthcare exchange, and will provide additional options for coverage. As a result of this plan change, the company will not be receiving a Medicare Part D subsidy for plan years beginning on or after January 1, 2011. The loss of Medicare Part D subsidy is considered in the calculation of the net prior service credit of $3 million resulting from the plan change. This amount will be amortized into the net periodic benefit costs (credits) over the life expectancy of the affected plan participants.    
Restructuring Activities   The 2011 curtailments and special termination benefits are related to involuntary terminations due to company-wide restructuring activities, and the sale of our hardwoods and Westwood Shipping Lines operations. The total curtailment charge for U.S. pension plans was $9 million. In addition, we recognized a $3 million settlement charge for a Canadian pension plan in fourth quarter 2011. There were no curtailment charges or credits to the U.S. or Canadian postretirement plans.Termination benefits were provided under the pension plan in the U.S. for those terminated employees who were not yet eligible to retire but whose age plus service was at least 65 and had at least ten years of service (Rule of 65). The 2010 curtailments and special termination benefits are related to involuntary terminations due to company-wide restructuring activities, the closure of Wood Products facilities and the sale of five short line railroads. The total curtailment charge for U.S. pension plans was $5 million. There were no curtailment charges or credits to the Canadian pension plans, or the U.S. or Canadian postretirement plans.Termination benefits were provided under the pension plan in the U.S. for those terminated employees who were not yet eligible to retire but whose age plus service was at least 65 and had at least ten years of service (Rule of 65).                    
Changes in Projected Benefit Obligations of Our Pension and Other Postretirement Benefit Plans
Changes in Projected Benefit Obligations of Our Pension and Other Postretirement Benefit Plans
DOLLAR AMOUNTS IN MILLIONS
  
PENSION
OTHER
POSTRETIREMENT
BENEFITS
  
2012

2011

2012

2011

Reconciliation of projected benefit obligation:
 
 
 
 
Projected benefit obligation beginning of year
$
5,841

$
5,267

$
402

$
496

Service cost
53

48

1

2

Interest cost
262

276

15

24

Plan participants’ contributions
—

—

18

19

Actuarial (gains) losses
708

611

(1
)
29

Foreign currency exchange rate changes
22

(15
)
2

(1
)
Benefits paid (includes lump sum settlements)
(323
)
(338
)
(53
)
(59
)
Plan amendments and other
12

(14
)
49

(108
)
Special termination benefits
—

6

—

—

Projected benefit obligation at end of year
$
6,575

$
5,841

$
433

$
402

                        
Changes in Fair Value of Plan Assets
Changes in Fair Value of Plan Assets
DOLLAR AMOUNTS IN MILLIONS
  
PENSION
OTHER
POSTRETIREMENT
BENEFITS
  
2012

2011

2012

2011

Fair value of plan assets at beginning of year (estimated)
$
4,714

$
4,773

$
—

$
—

Adjustment for final fair value of plan assets
16

138

—

—

Actual return on plan assets
490

49

—

—

Foreign currency exchange rate changes
15

(11
)
—

—

Employer contributions and benefit payments
110

103

35

40

Plan participants’ contributions
—

—

18

19

Benefits paid (includes lump sum settlements)
(323
)
(338
)
(53
)
(59
)
Fair value of plan assets at end of year (estimated)
$
5,022

$
4,714

$
—

$
—

                        
Funded Status of Our Pension and Other Postretirement Benefit Plans
Funded Status of Our Pension and Other Postretirement Benefit Plans
DOLLAR AMOUNTS IN MILLIONS
  
PENSION
OTHER
POSTRETIREMENT
BENEFITS
  
2012

2011

2012

2011

Noncurrent assets
$
2

$
1

$
—

$
—

Current liabilities
(21
)
(21
)
(37
)
(42
)
Noncurrent liabilities
(1,534
)
(1,107
)
(396
)
(360
)
Funded status
$
(1,553
)
$
(1,127
)
$
(433
)
$
(402
)
                        
Changes in Amounts Included in Cumulative Other Comprehensive Loss
Changes in Amounts Included in Cumulative Other Comprehensive Loss
DOLLAR AMOUNTS IN MILLIONS
  
PENSION
OTHER
POSTRETIREMENT
BENEFITS
  
2012

2011

2012

2011

Net amount at beginning of year
$
(1,693
)
$
(1,258
)
$
99

$
45

Net change during the year:
 

 

 

 

Net actuarial gain (loss):
 

 

 

 

Net actuarial loss arising during the year, including foreign currency exchange rate changes
(637
)
(837
)
—

(22
)
Amortization of net actuarial loss
175

140

13

13

Taxes
193

240

(2
)
3

Net actuarial gain (loss), net of tax
(269
)
(457
)
11

(6
)
Prior service credit (cost):
 

 

 

 

Prior service credit (cost) arising during the year
(12
)
14

(43
)
116

Amortization of prior service (credit) cost
8

23

(127
)
(22
)
Taxes
1

(15
)
50

(34
)
Prior service credit (cost), net of tax
(3
)
22

(120
)
60

Net amount recorded during the year
(272
)
(435
)
(109
)
54

Net amount at end of year
$
(1,965
)
$
(1,693
)
$
(10
)
$
99

                        
Retirement Compensation Arrangements Retirement Compensation Arrangements fund a portion of our Canadian nonregistered pension plans.Under Retirement Compensation Arrangements, our contributions are split:•50 percent to our investments in a portfolio of equities; and•50 percent to a noninterest-bearing refundable tax account held by the Canada Revenue Agency — as required by Canadian tax rules.The Canadian tax rules requirement means that — on average, over time — approximately 50 percent of our Canadian nonregistered pension plans’ assets do not earn returns.                        
Schedule of Allocation of Plan Assets [Table Text Block]
The net pension plan assets, when categorized in accordance with this fair value hierarchy, are as follows:
DOLLAR AMOUNTS IN MILLIONS
2012
Level 1

Level 2

Level 3

Total

Pension trust investments:
 
 
 
 
Fixed income instruments
$
476

$
93

$
—

$
569

Hedge funds
—

—

2,771

2,771

Private equity and related funds
—

(2
)
1,594

1,592

Real estate and related funds
—

—

91

91

Common and preferred stock and equity index instruments
—

4

—

4

Total pension trust investments
$
476

$
95

$
4,456

$
5,027

Accrued liabilities, net
 
 
 
(19
)
Pension trust net assets
 
 
 
$
5,008

Canadian nonregistered plan assets:
 
 
 
 
Cash
$
8

$
—

$
—

$
8

Investments
6

—

—

6

Total Canadian nonregistered plan assets
$
14

$
—

$
—

$
14

Total plan assets
 
 
 
$
5,022

DOLLAR AMOUNTS IN MILLIONS
2011
Level 1

Level 2

Level 3

Total

Pension trust investments:
 
 
 
 
Fixed income instruments
$
470

$
71

$
—

$
541

Hedge funds
—

—

2,436

2,436

Private equity and related funds
—

2

1,649

1,651

Real estate and related funds
—

—

96

96

Common and preferred stock and equity index instruments
1

1

—

2

Total pension trust investments
$
471

$
74

$
4,181

$
4,726

Accrued liabilities, net
 
 
 
(27
)
Pension trust net investments
 
 
 
$
4,699

Canadian nonregistered plan assets:
 
 
 
 
Cash
$
12

$
—

$
—

$
12

Investments
3

—

—

3

Total Canadian nonregistered plan assets
$
15

$
—

$
—

$
15

Total plan assets
 
 
 
$
4,714

    
Assets within our qualified and registered pension plans in our U.S. and Canadian pension trusts were invested as follows:
 
DECEMBER 31,
2012

DECEMBER 31,
2011

Fixed income
11.4
 %
11.5
 %
Hedge funds
55.3

51.9

Private equity and related funds
31.8

35.1

Real estate and related funds
1.8

2.1

Common and preferred stock and equity index instruments
0.1

—

Accrued liabilities
(0.4
)
(0.6
)
Total
100.0
 %
100.0
 %
      
Assets within our nonregistered plans that we are allowed to manage were invested as follows:
 
DECEMBER 31,
2012

DECEMBER 31,
2011

Equities
43.5
%
23.0
%
Cash and cash equivalents
56.5

77.0

Total
100.0
%
100.0
%
      
This table shows the fair value of the derivatives held by our pension trusts — which fund our qualified and registered plans — at the end of the last two years.
DOLLAR AMOUNTS IN MILLIONS
  
DECEMBER 31,
2012

DECEMBER 31,
2011

Equity index instruments
$
4

$
1

Forward contracts
(2
)
2

Swaps
288

220

Total
$
290

$
223
This table shows the aggregate notional amount of the derivatives held by our pension trusts — which fund our qualified and registered plans — at the end of the last two years.
DOLLAR AMOUNTS IN MILLIONS
  
DECEMBER 31,
2012

DECEMBER 31,
2011

Equity index instruments
$
569

$
390

Forward contracts
199

208

Swaps
1,538

1,291

Total
$
2,306

$
1,889
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
A reconciliation of the beginning and ending balances of the pension plan assets measured at fair value using significant unobservable inputs (Level 3) is presented below:
DOLLAR AMOUNTS IN MILLIONS
  
INVESTMENTS
  
Hedge funds

Private equity and
related funds

Real estate and
related funds

Total

Balance as of December 31, 2010
$
2,284

$
1,575

$
120

$
3,979

Net realized gains (losses)
95

(6
)
—

89

Net change in unrealized appreciation (depreciation)
(180
)
122

(21
)
(79
)
Net purchases, (sales) and (settlements)
237

(42
)
(3
)
192

Balance as of December 31, 2011
2,436

1,649

96

4,181

Net realized gains
70

146

6

222

Net change in unrealized appreciation
228

26

6

260

Net purchases, (sales) and (settlements)
37

(227
)
(17
)
(207
)
Balance as of December 31, 2012
$
2,771

$
1,594

$
91

$
4,456

                        
Net Periodic Benefit Cost (Credit)
Net Periodic Benefit Cost (Credit)
DOLLAR AMOUNTS IN MILLIONS
  
PENSION
OTHER POSTRETIREMENT
BENEFITS
  
2012

2011

2010

2012

2011

2010

Net periodic benefit cost (credit):
 
 
 
 
 
 
Service cost(1)(2)
$
53

$
48

$
44

$
1

$
2

$
2

Interest cost
262

276

278

15

24

24

Expected return on plan assets
(422
)
(421
)
(448
)
—

—

—

Amortization of actuarial loss
175

136

61

13

13

11

Amortization of prior service cost (credit)
7

14

18

(127
)
(22
)
(21
)
Recognition of curtailments, settlements and special termination benefits due to closures, restructuring or divestitures(2)
—

18

10

—

—

—

Other
—

—

—

4

4

—

Net periodic benefit cost (credit)
$
75

$
71

$
(37
)
$
(94
)
$
21

$
16

(1) During fourth quarter 2011, we ratified amendments to our postretirement medical and life insurance benefit plans for U.S. salaried employees that reduced or eliminated certain benefits that were available to both past and present employees. The company recognized a gain of $103 million in 2012 due to these benefit changes. This gain is included in other operating income and reflected in the amortization of prior service credit in the table above. The benefit related to the fourth quarter 2011 amendments was fully recognized in first and second quarter 2012.
(2) Service cost includes $2 million in 2011 and $3 million in 2010 for employees that were part of the sale of our hardwoods operations. Curtailment and special termination benefits includes charges of $11 million in 2011 related to the sale of our hardwoods and Westwood Shipping Lines operations. These charges are included in our results of discontinued operations.
                        
Estimated Amortization from Cumulative Other Comprehensive Loss in 2013
Estimated Amortization from Cumulative Other Comprehensive Loss in 2013
Amortization of the net actuarial loss and prior service cost (credit) of our pension and postretirement benefit plans will affect our other comprehensive income in 2013. The net effect of the estimated amortization will be an increase in net periodic benefit costs or a decrease in net periodic benefit credits in 2013.
DOLLAR AMOUNTS IN MILLIONS
  
PENSION

POSTRETIREMENT

TOTAL

Net actuarial loss
$
220

$
14

$
234

Prior service cost (credit)
7

(23
)
(16
)
Net effect cost (credit)
$
227

$
(9
)
$
218

                        
Estimated Projected Benefit Payments for the Next 10 Years
Estimated Projected Benefit Payments for the Next 10 Years
DOLLAR AMOUNTS IN MILLIONS
  
PENSION
OTHER
POSTRETIREMENT
BENEFITS
2013
$
329

$
37

2014
$
338

$
34

2015
$
342

$
32

2016
$
351

$
30

2017
$
359

$
29

2018-2022
$
1,897

$
126

                        
Discount Rates and Rates of Compensation Increase Used in Estimating Our Pension and Other Postretirement Benefit Obligation
Discount Rates and Rates of Compensation Increase Used in Estimating Our Pension and Other Postretirement Benefit Obligation
  
PENSION
OTHER POSTRETIREMENT
BENEFITS
  
DECEMBER 31,
2012

DECEMBER 31,
2011

DECEMBER 31,
2012

DECEMBER 31,
2011

Discount rates:
 
 
 
 
U.S.
3.70
%
4.50
%
3.00
%
4.10
%
Canada
4.10
%
4.90
%
4.00
%
4.80
%
Lump sum distributions (US salaried and nonqualified plans only)(1)
Variable
Variable
N/A

N/A

Rate of compensation increase:
 

 

 

 

Salaried:
 

 

 

 

United States
2.00% for 2012
2.50% for 2013
and 3.5% thereafter
2.00% for 2011
2.00% for 2012
and 3.5% thereafter
N/A

N/A

Canada
2.10% for 2012
2.50% for 2013
and 3.5% thereafter
2.00% for 2011
2.10% for 2012
and 3.5% thereafter
N/A

2.00% for 2011
2.10% for 2012
and 3.5% thereafter
Hourly:
 
 
 
 
United States
3.00
%
3.00
%
3.00
%
3.00
%
Canada
3.25
%
3.25
%
N/A

N/A

Election of lump sum or installment distributions (US salaried and nonqualified plans only)
56.00
%
60.00
%
N/A

N/A

(1) The discount rates applicable to lump sum distributions vary based on expected retirement dates of the covered employees. The discount rates are determined in accordance with the Pension Protection Act.
                        
Rates Used to Estimate Our Net Periodic Benefit Costs
Rates Used to Estimate Our Net Periodic Benefit Costs
  
PENSION
OTHER
POSTRETIREMENT
BENEFITS
  
2012
2011
2010
2012
2011
2010
Discount rates:
 
 
 
 
 
 
U.S.
4.50%
5.40%
5.90%
4.10%
5.00%
5.20%
Salaried – lump sum distributions (U.S. salaried and nonqualified plan only)(1)
PPA Table
PPA phased
Table
PPA phased
Table
N/A
N/A
N/A
Canada
4.90%
5.30%
6.10%
4.80%
5.20%
6.00%
Expected return on plan assets:
 
 
 
 
 
 
Qualified/registered plans
9.00%
9.50%
9.50%
 
 
 
Nonregistered plans (Canada only)
3.50%
4.75%
4.75%
 
 
 
Rate of compensation increase:
 
 
 
 
 
 
Salaried:
 
 
 
 
 
 
U.S.
2.00% for 2012
3.50% thereafter
2.00% for 2011
3.50% thereafter
1.75% for 2010
3.50% thereafter
N/A
N/A
N/A
Canada
2.10% for 2012
3.50% thereafter
2.00% for 2011
3.50% thereafter
1.75% for 2010
3.50% thereafter
2.10% for 2012
3.50% thereafter
2.00% for 2011
3.50% thereafter
3.50%
Hourly:
 
 
 
 
 
 
U.S.
3.00%
3.00%
3.00%
3.00%
3.00%
3.00%
Canada
3.25%
3.25%
3.25%
N/A
N/A
N/A
Election of lump sum distributions (U.S. salaried and nonqualified plans only)
60.00%
65.00%
72.00%
N/A
N/A
N/A
(1) PPA Phased Table: Interest and mortality assumptions as mandated by Pension Protection Act of 2006 including the phase out of the prior interest rate basis in 2012.
                        
Expected Return on Plan Assets               Canadian tax rules require that 50 percent of the assets for nonregistered plans go to a noninterest-bearing refundable tax account. As a result, the return we earn investing the other 50 percent is spread over 100 percent of the assets. is comprised of: •a 7.3 percent assumed return from direct investments and•a 1.7 percent assumed return from derivatives.Determining our expected return:•requires a high degree of judgment,•uses our historical fund returns as a base and•places added weight on more recent pension plan asset performance.Over the 28 years it has been in place, our U.S. pension trust investment strategy has achieved a 14.8 percent net compound annual return rate.        
Actual Returns on Assets Held by Our Pension Trusts
DOLLAR AMOUNTS IN MILLIONS
  
2012

2011

2010

Direct investments
$
324

$
48

$
362

Derivatives
166

1

153

Total
$
490

$
49

$
515

                        
Assumptions We Use in Estimating Health Care Benefit Costs
Assumptions We Use in Estimating Health Care Benefit Costs
  
2012
2011
  
U.S.

CANADA

U.S.

CANADA

Weighted health care cost trend rate assumed for next year
6.70
%
7.10
%
6.80
%
7.30
%
Rate to which cost trend rate is assumed to decline (ultimate trend rate)
4.50
%
4.50
%
4.50
%
4.50
%
Year that the rate reaches the ultimate trend rate
2029

2030

2029

2030

                        
Effect of a1 Percent Change in Health Care Costs
Effect of a 1 Percent Change in Health Care Costs
AS OF DECEMBER 31, 2012 (DOLLAR AMOUNTS IN MILLIONS)
  
1% INCREASE

1% DECREASE

Effect on total service and interest cost components
$
1

$
(1
)
Effect on accumulated postretirement benefit obligation
$
12

$
(10
)