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Pension and Other Benefit Plans - Pension Plan, Net Periodic Costs and Other Changes (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Retirement Benefits [Abstract]
Service cost	$ 13	$ 13
Interest cost	75	74
Expected return on assets	(117)	(113)
Amortization of prior service credit	(1)	(1)
Net periodic pension income	$ (30)	$ (27)

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