v2.4.0.8
Information for Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 22,610 $ 26,351
Accumulated benefit obligation 22,492 26,081
Fair value of plan assets $ 16,350 $ 17,623