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Retirement Plans - Schedule of Net Periodic Pension Benefit/Cost (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Retirement Benefits [Abstract]
Service cost	$ 9	$ 12	$ 31	$ 39
Interest cost	45	47	135	139
Expected return on plan assets	(60)	(63)	(181)	(189)
Amortization of actuarial loss	2	4	6	8
Net periodic pension (benefit)/cost	$ (4)	$ 0	$ (9)	$ (3)

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