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Net Periodic Benefit Cost - Continuing Operations (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Pension Benefits, Defined Benefit    
Net periodic benefit cost    
Service cost $ 23 $ 23
Interest cost 46 49
Expected return on plan assets (75) (61)
Amortization of net losses and other deferred amounts 37 43
Net periodic OPEB cost 31 54
Other Postretirement Benefit Plans, Defined Benefit    
Net periodic benefit cost    
Service cost 1 1
Interest cost 2 6
Amortization of net loss and prior service credit (4) (1)
Net periodic OPEB cost $ (1) $ 6