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Employee Benefits - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Plans [Member]      
Components Of Net Periodic Benefit Cost      
Service cost $ 265 $ 235 $ 192
Interest cost 219 235 249
Expected return on plan assets (450) (403) (383)
Prior service cost (credit) and transition obligation (asset) amortization (2)    
Actuarial loss (gain) amortization 169 134 98
Net periodic benefit cost 201 201 156
Net actuarial gain (loss) arising during the year 398 (420) (388)
Net actuarial loss (gain) amortized during the year 169 134 98
Net prior service (cost) credit and transition (obligation) asset arising during the year   18  
Net prior service cost (credit) and transition obligation (asset) amortized during the year (2)    
Total recognized in other comprehensive income (loss) 565 (268) (290)
Total recognized in net periodic benefit cost and other comprehensive income (loss) 364 (469) (446)
Postretirement Welfare Plan [Member]      
Components Of Net Periodic Benefit Cost      
Interest cost 1 1 2
Expected return on plan assets   (3) (3)
Prior service cost (credit) and transition obligation (asset) amortization (3) (3) (3)
Actuarial loss (gain) amortization (7) (6) (6)
Net periodic benefit cost (9) (11) (10)
Net actuarial gain (loss) arising during the year 2 1 7
Net actuarial loss (gain) amortized during the year (7) (6) (6)
Net prior service cost (credit) and transition obligation (asset) amortized during the year (3) (3) (3)
Total recognized in other comprehensive income (loss) (8) (8) (2)
Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 1 $ 3 $ 8