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Retirement Plans and Profit Sharing Arrangements (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Private real estate investment trust
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets   $ 8
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year   8
Pension Plans
   
Defined Benefit Plan, Assets, Target Allocations    
Equity securities (as a percent) 70.00%  
Debt securities (as a percent) 20.00%  
Other types of investments (as a percent) 10.00%  
Range of the difference between the actual allocation and target allocations (as a percent) 5.00%  
Fair Value of Plan Assets 362 327
Summary of changes in Level 3 assets measured at fair value on a recurring basis    
Fair value of plan assets at the beginning of the year 327 256
Actual return (loss) on plan assets:    
Settlements (18) (24)
Fair value of plan assets at the end of the year 362 327
Expected benefit payments to retirees    
2012 45  
2013 48  
2014 49  
2015 51  
2016 53  
2017-2021 250  
Expected contribution to pension plans 46  
Pension Plans | Private real estate investment trust
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 11 8
Summary of changes in Level 3 assets measured at fair value on a recurring basis    
Fair value of plan assets at the beginning of the year 8 5
Actual return (loss) on plan assets:    
Relating to assets still held at the reporting date 1 1
Purchase 2  
Purchases, sales, and settlements, net   2
Fair value of plan assets at the end of the year 11 8
Pension Plans | Hedge funds
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 12 9
Summary of changes in Level 3 assets measured at fair value on a recurring basis    
Fair value of plan assets at the beginning of the year 9  
Actual return (loss) on plan assets:    
Purchase 11  
Sales (8)  
Purchases, sales, and settlements, net   9
Fair value of plan assets at the end of the year 12 9
Pension Plans | Pooled pension funds
   
Defined Benefit Plan, Assets, Target Allocations    
Equity securities (as a percent) 82.00%  
Debt securities (as a percent) 14.00%  
Other types of investments (as a percent) 4.00%  
Range of the difference between the actual allocation and target allocations (as a percent) 5.00%  
Percentage of excess return on pooled pension funds 1.50%  
Period to calculate the return on pooled pension funds (in years) 3  
Pension Plans | Level 1
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 169 163
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 169 163
Pension Plans | Level 1 | U.S. large cap stocks
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 75 72
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 75 72
Pension Plans | Level 1 | U.S. small cap stocks
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 38 33
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 38 33
Pension Plans | Level 1 | Non-U.S. large cap stocks
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 14 12
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 14 12
Pension Plans | Level 1 | Emerging markets
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 10 15
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 10 15
Pension Plans | Level 1 | U.S. investment grade bonds
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 17 13
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 17 13
Pension Plans | Level 1 | Cash equivalents
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 15 18
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 15 18
Pension Plans | Level 2
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 170 147
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 170 147
Pension Plans | Level 2 | U.S. large cap stocks
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 9 3
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 9 3
Pension Plans | Level 2 | U.S. small cap stocks
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 1 1
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 1 1
Pension Plans | Level 2 | Non-U.S. large cap stocks
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 23 18
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 23 18
Pension Plans | Level 2 | Emerging markets
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 15 14
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 15 14
Pension Plans | Level 2 | U.S. investment grade bonds
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 15 9
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 15 9
Pension Plans | Level 2 | U. S. high yield bonds
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 11 11
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 11 11
Pension Plans | Level 2 | Foreign government bonds and obligations
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 16 12
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 16 12
Pension Plans | Level 2 | Pooled pension funds
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 80 79
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 80 79
Pension Plans | Level 3
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 23 17
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 23 17
Pension Plans | Level 3 | Private real estate investment trust
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 11 8
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 11 8
Pension Plans | Level 3 | Hedge funds
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 12 9
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 12 9
Pension Plans | Total
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 362 327
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 362 327
Pension Plans | Total | U.S. large cap stocks
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 84 75
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 84 75
Pension Plans | Total | U.S. small cap stocks
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 39 34
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 39 34
Pension Plans | Total | Non-U.S. large cap stocks
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 37 30
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 37 30
Pension Plans | Total | Emerging markets
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 25 29
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 25 29
Pension Plans | Total | U.S. investment grade bonds
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 32 22
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 32 22
Pension Plans | Total | U. S. high yield bonds
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 11 11
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 11 11
Pension Plans | Total | Foreign government bonds and obligations
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 16 12
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 16 12
Pension Plans | Total | Private real estate investment trust
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 11 8
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 11 8
Pension Plans | Total | Hedge funds
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 12 9
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 12 9
Pension Plans | Total | Pooled pension funds
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 80 79
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 80 79
Pension Plans | Total | Cash equivalents
   
Defined Benefit Plan, Assets, Target Allocations    
Fair Value of Plan Assets 15 18
Actual return (loss) on plan assets:    
Fair value of plan assets at the end of the year 15 18
Other Postretirement Benefits
   
Expected benefit payments to retirees    
2012 2  
2013 2  
2014 2  
2015 1  
2016 1  
2017-2021 7  
Expected contribution to pension plans $ 2