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Employee Benefit Plans (Net Periodic Benefit Cost (Credit)) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 24 $ 36
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 $ 111 $ 83
Expected return on plan assets (216) (223)
Amortization of net actuarial (gain) loss   40
Net periodic benefit (credit) cost (81) (64)
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 3 $ 6
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 $ 15 $ 11
Expected return on plan assets (38) (48)
Amortization of prior service cost (credit) (9) (10)
Amortization of net actuarial (gain) loss 1  
Net periodic benefit (credit) cost $ (30) $ (41)