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Retirement Plans - Schedule of Net Periodic Pension Benefit/Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Retirement Benefits [Abstract]
Service cost	$ 11	$ 13
Interest cost	45	46
Expected return on plan assets	(60)	(63)
Amortization of actuarial loss	2	2
Net periodic pension (benefit)/cost	$ (2)	$ (2)

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