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Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 5,025 $ 4,292
Accumulated benefit obligation 3,985 3,655
Fair value of plan assets $ 3,164 $ 2,794