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Pension and Other Postretirement Benefits (Components of Net Periodic Benefit Costs) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension Benefits        
Components of net periodic benefit cost:        
Service cost $ 65 $ 72 $ 133 $ 148
Interest cost 24 23 47 46
Expected return on plan assets (37) (29) (78) (62)
Amortization of prior service cost (credit) (12) (12) (23) (23)
Amortization of actuarial loss 3 14 7 25
Settlement loss 54 49 56 49
Net periodic benefit cost 97 117 142 183
Other Benefits        
Components of net periodic benefit cost:        
Service cost 5 7 13 17
Interest cost 5 8 10 15
Amortization of prior service cost (credit) (6) 0 (11) 1
Amortization of actuarial loss 1 3 3 5
Net periodic benefit cost $ 5 $ 18 $ 15 $ 38