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Pension and Other Postretirement Employee Benefit Plans - Weighted-Average Assumptions Benefit Obligations (Details 5) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Projected Increase In US Defined Benefit Pension And OPEB Plan Expense Resulting From Decreased Discount Rates For Benefit Obligations 48    
Minimum [Member]
     
Weighted-average assumptions used to determine benefit obligations      
Investment Advisor Definition of Long Term 10 years    
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]      
Term of iBoxx corporate AA bond index used determining discount rate for the UK defined benefit pension and OPEB plans 15 years    
Foreign Pension Plans, Defined Benefit [Member] | Minimum [Member]
     
Discount rate:      
Defined benefit pension plans and OPEB plans 1.40% 1.50%  
Rate of compensation increase 2.75% 2.75%  
Foreign Pension Plans, Defined Benefit [Member] | Maximum [Member]
     
Discount rate:      
Defined benefit pension plans and OPEB plans 4.40% 4.80%  
Rate of compensation increase 4.10% 4.20%  
Defined Benefit Pension Plans, U.S. [Member]
     
Discount rate:      
Defined benefit pension plans and OPEB plans 3.90% 4.60%  
OPEB plans, U.S. [Member]
     
Discount rate:      
Defined benefit pension plans and OPEB plans 3.90% 4.70%  
OPEB plans, Non-U.S. [Member]
     
Discount rate:      
Defined benefit pension plans and OPEB plans 0.00% 0.00%  
Pension and other postretirement employee benefit plans, U.S. [Member]
     
Discount rate:      
Rate of compensation increase 4.00% 4.00%  
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]      
Assumed for next year 7.00% 7.00% 7.75%
Ultimate 5.00% 5.00% 5.00%
Year when rate will reach ultimate 2017 2017 2014
Foreign Pension Plans and Other Foreign Postretirement Benefit Plans [Member]
     
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]      
Assumed for next year 0.00% 0.00% 0.00%
Ultimate 0.00% 0.00% 0.00%