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Pension Plans and Other Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2012
Table Text Block [Abstract]  
Schedule of Changes in Benefit Obligations
             
  Pension Benefits Other Benefits
millions2012 2011 2012 2011
Change in benefit obligation           
Benefit obligation at beginning of year$2,024 $1,882 $354 $316
Service cost 76  78  9  9
Interest cost 85  85  16  16
Plan amendments  —  (12)   —   —
Actuarial (gain) loss 224  94  (1)  30
Participant contributions 1  1  3  4
Benefit payments (117)  (103)  (22)  (21)
Foreign-currency exchange-rate changes 4  (1)   —   —
Benefit obligation at end of year (1)$2,297 $2,024 $359 $354

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(1)        The accumulated benefit obligation for all defined-benefit pension plans was $2.1 billion at December 31, 2012, and $1.9 billion at December 31, 2011.
Schedule of Changes in Fair Value of Plan Assets
             
Change in plan assets           
Fair value of plan assets at beginning of year$1,308 $1,104 $ — $ —
Actual return on plan assets 159  (4)   —   —
Employer contributions 107  311  19  17
Participant contributions 1  1  3  4
Benefit payments (117)  (103)  (22)  (21)
Foreign-currency exchange-rate changes 4  (1)   —   —
Fair value of plan assets at end of year$1,462 $1,308 $ — $ —
Schedule of the Funded Status of the Plans
             
Funded status of the plans at end of year$(835) $(716) $(359) $(354)
Schedule of Amounts Recognized in Balance Sheet
             
Total recognized amounts in the balance sheet consist of           
 Other assets$30 $11 $ — $ —
 Accrued expenses (44)  (33)  (16)  (18)
 Other long-term liabilities—other (821)  (694)  (343)  (336)
Total$(835) $(716) $(359) $(354)
Schedule of Total Recognized Amounts in Accumulated Other Comprehensive Income
             
Total recognized amounts in accumulated other            
 comprehensive income consist of           
 Prior service cost (credit)$(2) $(2) $3 $5
 Net actuarial (gain) loss 916  853  (4)  (4)
Total$914 $851 $(1) $1
             
             
Schedule of Defined-Benefit Pension Plans With Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
             
             
        Pension Benefits
millions      2012 2011
Projected benefit obligation      $2,198 $1,925
Accumulated benefit obligation       2,054  1,818
Fair value of plan assets       1,333  1,198
             
             
Components of Net Periodic Benefit Cost Table
                   
                   
  Pension Benefits Other Benefits
millions2012 2011 2010 2012 2011 2010
Components of net periodic benefit cost                 
Service cost$76 $78 $69 $9 $9 $9
Interest cost 85  85  84  16  16  16
Expected return on plan assets (91)  (85)  (80)   —   —   —
Amortization of net actuarial loss (gain) 93  85  65   —   —  (3)
Amortization of net prior service cost (credit)  —  2  3  2   —  (1)
Net periodic benefit cost$163 $165 $141 $27 $25 $21
                   
Schedule of Amounts Recognized in Other Comprehensive Income
                   
Amounts recognized in other comprehensive                  
 income (expense)                 
Net actuarial gain (loss)$(156) $(183) $(151) $1 $(30) $8
Amortization of net actuarial (gain) loss 93  85  65   —   —  (3)
Net prior service (cost) credit  —  12  (6)   —   —   —
Amortization of net prior service cost (credit)  —  2  3  2   —  (1)
Total amounts recognized in other comprehensive                 
 income (expense)$(63) $(84) $(89) $3 $(30) $4
                   
                   
Schedule of Assumptions Used
               
               
    Pension Benefits Other Benefits
  2012 2011 2012 2011
Discount rate 3.50% 4.50% 4.00% 4.75%
Rates of increase in compensation levels 4.50% 4.50% 4.50% 4.50%
               
               

                     
                     
    Pension Benefits Other Benefits
  2012 2011 2010 2012 2011 2010
Discount rate 4.50% 4.75% 5.25% 4.75% 5.25% 5.50%
Long-term rate of return on plan assets 7.00% 7.00% 7.50% N/A  N/A  N/A 
Rates of increase in compensation levels 4.50% 5.00% 5.00% 4.50% 5.00% 5.00%
                     
                     
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
       
       
millions 1% Increase 1% Decrease
Effect on total of service and interest cost components $3 $(2)
Effect on other postretirement benefit obligation $28 $(24)
       
       
Fair Value Hierarchy of Plan Assets Table
             
millions            
December 31, 2012Level 1 Level 2 Level 3 Total
Investments           
Cash and cash equivalents$23 $36 $ — $59
Fixed income           
 Mortgage-backed securities  —  63   —  63
 U.S. government securities  —  54   —  54
 Other fixed-income securities (1) 40  196   —  236
Equity securities           
 Domestic 313  109   —  422
 International 112  238   —  350
Other           
 Real estate  —  46  78  124
 Private equity  —   —  64  64
 Hedge funds and other alternative strategies 20   —  77  97
Total investments (2)$508 $742 $219 $1,469
             
Liabilities           
 Hedge funds and other alternative strategies$(11) $ — $ — $(11)
Total liabilities$(11) $ — $ — $(11)

             
December 31, 2011           
Investments           
Cash and cash equivalents$37 $54 $ — $91
Fixed income           
 Mortgage-backed securities  —  66   —  66
 U.S. government securities 1  49   —  50
 Other fixed-income securities (1) 36  171   —  207
Equity securities           
 Domestic 265  94   —  359
 International 91  203   —  294
Other           
 Real estate  —  37  72  109
 Private equity  —   —  55  55
 Hedge funds and other alternative strategies 26   —  64  90
Total investments (3)$456 $674 $191 $1,321
             
Liabilities           
 Hedge funds and other alternative strategies$(12) $ — $ — $(12)
Total liabilities$(12) $ — $ — $(12)

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(1)         Amounts include investments in diversified fixed-income collective investment funds with exposure to mortgage-backed securities, government-issued securities, corporate debt, and other fixed-income securities.

(2)         Amount excludes net receivables of $4 million, primarily related to Level 1 investments.

(3)         Amount excludes net payables of $1 million, primarily related to Level 1 investments.

 
Schedule of Changes in Level 3 Fair Value of Investments
              
              
   Hedge Funds         
   and Other          
   Alternative Private     
millionsStrategies Equity Real Estate Total
Balance at January 1, 2012$64 $55 $72 $191
 Acquisitions (dispositions), net 9  4  2  15
 Actual return on plan assets           
  Relating to assets sold during the reporting period (2)  2   —   —
  Relating to assets still held at the reporting date 6  3  4  13
Balance at December 31, 2012$77 $64 $78 $219
              
Balance at January 1, 2011$49 $41 $9 $99
 Acquisitions (dispositions), net 17  6  60  83
 Actual return on plan assets           
  Relating to assets sold during the reporting period (1)  1   —   —
  Relating to assets still held at the reporting date (1)  7  3  9
Balance at December 31, 2011$64 $55 $72 $191
              
              
Schedule of Expected Future Benefit Payments
       
       
  Pension Other
  Benefit Benefit
millions Payments Payments
2013 $269 $16
2014  257  18
2015  248  19
2016  240  20
2017  230  22
2018-2022  901  117