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Long-Term Employee Benefit Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Long-term employee benefit liabilities      
Defined benefit pension plans and other $ 143 $ 97 $ 110
Termination and long service arrangements 229 212 184
Retirement medical benefits plans 37 34 34
Other long-term employee benefits 10 13 11
Long-term employee benefit obligations $ 419 $ 356 $ 339