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Pension Benefits - Schedule of Components of Net Periodic Benefit Cost (Detail) - Pension - 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	$ 9	$ 10	$ 27	$ 29
Interest cost	15	14	44	41
Expected return on assets	(21)	(20)	(62)	(59)
Amortization of prior service cost	1	2	4	5
Amortization of actuarial loss	0	0	1	1
Settlement charge	5	0	5	0
Net periodic benefit cost (credit)	$ 9	$ 6	$ 19	$ 17

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