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)

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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, 2012
U.S. Postretirement Medical Benefits
 
Defined Benefit Plan Disclosure [Line Items]  
Effect on total of service cost and interest cost, 1% Increase $ 4
Effect on postretirement benefit obligation, 1% Increase 58
Effect on total of service cost and interest cost, 1% Decrease (4)
Effect on postretirement benefit obligation, 1% Decrease $ (69)