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Employee Benefit Plans (Net Periodic Benefit Cost (Credit)) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 22 $ 24
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Interest cost $ 109 $ 111
Expected return on plan assets (204) (216)
Amortization of net actuarial (gain) loss 6  
Plan amendment 22  
Net periodic benefit (credit) cost (45) (81)
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 3 $ 3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Interest cost $ 14 $ 15
Expected return on plan assets (42) (38)
Amortization of prior service cost (credit) (9) (9)
Amortization of net actuarial (gain) loss (2) (1)
Net periodic benefit (credit) cost $ (36) $ (30)