Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Effects of One Percent Change in Assumed Health Care Cost Trend (Detail)

v2.4.1.9
COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Effects of One Percent Change in Assumed Health Care Cost Trend (Detail) (U.S. Postretirement Medical Benefits, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
U.S. Postretirement Medical Benefits
 
Defined Benefit Plan Disclosure [Line Items]  
Effect on total of service cost and interest cost, 1% Increase $ 4us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
Effect on postretirement benefit obligation, 1% Increase 89us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
Effect on total of service cost and interest cost, 1% Decrease (4)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
Effect on postretirement benefit obligation, 1% Decrease $ (98)us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember