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Employee Benefit Plans (Components of Provision for Net Periodic Benefit Cost (Credit)) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 19 | $ 22
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 | $ 108 | $ 109
Expected return on plan assets | (169) | (204)
Amortization of prior service cost (credit) | 0 | 0
Amortization of net actuarial (gain) loss | 0 | (170)
Curtailments | 0 | (31)
Plan amendment | 0 | 22
Net periodic benefit (credit) cost | (42) | (252)
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 | $ 14
Expected return on plan assets | (40) | (42)
Amortization of prior service cost (credit) | (6) | (9)
Amortization of net actuarial (gain) loss | 0 | (32)
Curtailments | 0 | (4)
Plan amendment | 0 | 0
Net periodic benefit (credit) cost | $ (29) | $ (70)

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