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Pension, Other Postretirement Benefits (OPEB) and Savings Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period due to Plan Experience and Assumption Changes | $ (104) | $ (35)
Net Actuarial (Gain) Loss due to Settlements/Curtailments | 0 | (39)
Amortization of Net Actuarial Gain (Loss) | (71) | (83)
Recognition of Net Actuarial (Gain) Loss due to Settlements/Curtailments | 0 | (338)
Prior Service Cost (Credit) in Current Period | 0 | 0
Amortization of Prior Service Credit | 0 | 0
Total | (175) | (495)
Other Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net Actuarial (Gain) Loss in Current Period due to Plan Experience and Assumption Changes | (22) | (49)
Net Actuarial (Gain) Loss due to Settlements/Curtailments | 0 | 0
Amortization of Net Actuarial Gain (Loss) | 2 | 2
Recognition of Net Actuarial (Gain) Loss due to Settlements/Curtailments | 0 | 0
Prior Service Cost (Credit) in Current Period | 0 | 6
Amortization of Prior Service Credit | (2) | 52
Total | $ (22) | $ 11

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