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Retirement and Postretirement Plans - Summary of Components of Net Periodic Benefit Cost (Credit) for Plans (Details) - Pension Benefit Plans [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest cost | $ 19 | $ 19 | $ 39 | $ 38
Expected return on plan assets | (26) | (25) | (52) | (50)
Amortization of net gain | (1) | (1) | (3) | (3)
Net periodic benefit credit | $ (8) | $ (7) | $ (16) | $ (15)

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