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Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Costs (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Pension Benefits    
Components of net periodic benefit cost:    
Service cost $ 69 $ 58
Interest cost 25 28
Expected return on plan assets (34) (32)
Amortization – prior service credit (11) (11)
Amortization – actuarial loss 8 4
Amortization - settlement loss 0 0
Net periodic benefit cost 57 47
Other Benefits    
Components of net periodic benefit cost:    
Service cost 9 8
Interest cost 8 9
Expected return on plan assets 0 0
Amortization – prior service credit 0 0
Amortization – actuarial loss 1 0
Amortization - settlement loss 0 0
Net periodic benefit cost $ 18 $ 17