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Defined Benefit Pension and Other Postretirement Plans - Components of Net Periodic Benefit Costs (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Pension Benefits    
Components of net periodic benefit cost:    
Service cost $ 31 $ 28
Interest cost 19 19
Expected return on plan assets (26) (25)
Amortization – prior service credit (10) (11)
Amortization – actuarial loss 9 10
Amortization - settlement loss 0 1
Net periodic benefit cost 23 22
Other Benefits    
Components of net periodic benefit cost:    
Service cost 7 8
Interest cost 8 9
Expected return on plan assets 0 0
Amortization – prior service credit (1) (1)
Amortization – actuarial loss 0 1
Amortization - settlement loss 0 0
Net periodic benefit cost $ 14 $ 17