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Long-Term Debt - Total Long-Term Debt Outstanding Maturities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Debt Disclosure [Abstract]  
2015 $ 202us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016 193us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017 117us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018 116us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2019 715us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter 574us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Total $ 1,917stm_DebtMaturities