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Post-Employment and Other Long-Term Employees Benefits - Pension Plan Asset Allocation (Detail)
Dec. 31, 2013
Dec. 31, 2012
Allocation of pension plan assets 100.00% 100.00%
Equity Securities [Member]
   
Allocation of pension plan assets 43.00% 37.00%
Bonds Securities Remunerating Interest [Member]
   
Allocation of pension plan assets 30.00% 31.00%
Real Estate [Member]
   
Allocation of pension plan assets 2.00% 2.00%
Other [Member]
   
Allocation of pension plan assets 25.00% 30.00%