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Post-Retirement and Other Long-Term Employees Benefits - Accumulated Other Comprehensive Income (Loss) Before Tax Effects (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Other comprehensive loss, actuarial (gains)/losses, beginning balance $ 175 $ 86
Net amount generated/arising in current year, actuarial (gains)/losses 43 98
Amortization, actuarial (gains)/losses (14) (6)
Foreign currency translation, actuarial (gains)/losses before tax 5 (3)
Other comprehensive loss, actuarial (gains)/losses, ending balance 209 175
Other comprehensive loss, prior service cost, beginning balance 10 11
Net amount generated/arising in current year, prior service cost 4  
Amortization, prior service cost (5) (1)
Other comprehensive loss, prior service cost, ending balance 9 10
Other comprehensive loss, Total, beginning balance 185 97
Net amount generated/arising in current year, Total 47 98
Amortization, Total (19) (7)
Foreign currency translation adjustment, Total 5 (3)
Other comprehensive loss, Total, ending balance $ 218 $ 185