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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