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Retirement Plans and Profit Sharing Arrangements (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Plans
     
Defined Benefit Plan, Assets, Target Allocations      
Range of the difference between the actual allocation and target allocations (as a percent) 5.00%    
Fair Value of Plan Assets $ 437   $ 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 362    
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 437   327
Expected benefit payments to retirees      
2013 53    
2014 58    
2015 57    
2016 58    
2017 62    
2018-2022 282    
Expected contribution to pension plans 50    
Pension Plans | Debt securities
     
Defined Benefit Plan, Assets, Target Allocations      
Defined Benefit Plan, Assets, Target Allocations (as a percent) 20.00%    
Defined Benefit Plan, Assets in pooled pension funds, Target Allocations (as a percent) 15.00%    
Pension Plans | Common Stocks
     
Defined Benefit Plan, Assets, Target Allocations      
Defined Benefit Plan, Assets, Target Allocations (as a percent) 70.00%    
Defined Benefit Plan, Assets in pooled pension funds, Target Allocations (as a percent) 80.00%    
Pension Plans | Real estate investment trust
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 12 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 11 8 5
Actual return (loss) on plan assets:      
Relating to assets still held at the reporting date   1 1
Purchase 1 2 2
Fair value of plan assets at the end of the year 12 11 8
Pension Plans | Hedge funds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 18 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 12 9  
Actual return (loss) on plan assets:      
Relating to assets still held at the reporting date 1    
Purchase 5 11 9
Sales   (8)  
Fair value of plan assets at the end of the year 18 12 9
Pension Plans | Pooled pension funds
     
Actual return (loss) on plan assets:      
Percentage of excess return on pooled pension funds 1.50%    
Period to calculate the return on pooled pension funds 3 years    
Pension Plans | Other assets
     
Defined Benefit Plan, Assets, Target Allocations      
Defined Benefit Plan, Assets, Target Allocations (as a percent) 10.00%    
Defined Benefit Plan, Assets in pooled pension funds, Target Allocations (as a percent) 5.00%    
Pension Plans | Level 1
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 191 169  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 191 169  
Pension Plans | Level 1 | U.S. large cap stocks
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 89 75  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 89 75  
Pension Plans | Level 1 | U.S. small cap stocks
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 43 38  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 43 38  
Pension Plans | Level 1 | Non-U.S. large cap stocks
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 17 14  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 17 14  
Pension Plans | Level 1 | Emerging markets
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 13 10  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 13 10  
Pension Plans | Level 1 | U.S. investment grade bonds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 20 17  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 20 17  
Pension Plans | Level 1 | Cash equivalents
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 9 15  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 9 15  
Pension Plans | Level 2
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 216 170  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 216 170  
Pension Plans | Level 2 | U.S. large cap stocks
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 14 9  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 14 9  
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 30 23  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 30 23  
Pension Plans | Level 2 | Emerging markets
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 20 15  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 20 15  
Pension Plans | Level 2 | U.S. investment grade bonds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 12 15  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 12 15  
Pension Plans | Level 2 | U. S. high yield bonds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 20 11  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 20 11  
Pension Plans | Level 2 | Non-U.S. investment grade bonds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 15 16  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 15 16  
Pension Plans | Level 2 | Pooled pension funds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 104 80  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 104 80  
Pension Plans | Level 3
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 30 23  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 30 23  
Pension Plans | Level 3 | Real estate investment trust
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 12 11  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 12 11  
Pension Plans | Level 3 | Hedge funds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 18 12  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 18 12  
Pension Plans | Total
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 438 362  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 438 362  
Pension Plans | Total | U.S. large cap stocks
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 103 84  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 103 84  
Pension Plans | Total | U.S. small cap stocks
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 44 39  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 44 39  
Pension Plans | Total | Non-U.S. large cap stocks
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 47 37  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 47 37  
Pension Plans | Total | Emerging markets
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 33 25  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 33 25  
Pension Plans | Total | U.S. investment grade bonds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 32 32  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 32 32  
Pension Plans | Total | U. S. high yield bonds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 20 11  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 20 11  
Pension Plans | Total | Non-U.S. investment grade bonds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 15 16  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 15 16  
Pension Plans | Total | Real estate investment trust
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 12 11  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 12 11  
Pension Plans | Total | Hedge funds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 18 12  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 18 12  
Pension Plans | Total | Pooled pension funds
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 105 80  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 105 80  
Pension Plans | Total | Cash equivalents
     
Defined Benefit Plan, Assets, Target Allocations      
Fair Value of Plan Assets 9 15  
Actual return (loss) on plan assets:      
Fair value of plan assets at the end of the year 9 15  
Other Postretirement Benefits
     
Expected benefit payments to retirees      
2013 2    
2014 2    
2015 2    
2016 2    
2017 1    
2018-2022 7    
Expected contribution to pension plans $ 2