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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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Service cost				$ 1
Interest cost	$ 20	$ 20	$ 59	58
Expected return on plan assets	(26)	(25)	(77)	(75)
Amortization of net gain	(1)	(1)	(4)	(4)
Net periodic benefit credit	$ (7)	$ (6)	$ (22)	$ (20)

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