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Pension and Other Benefit Plans - Pension Plan, Amounts Recognized in Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Other assets	$ 1,181	$ 874
Accrued expenses and other current liabilities	(30)	(34)
Non-current pension obligations	(387)	(423)
Other long-term liabilities - OPEB	(13)	(14)
Net amount recorded	751	403
Accumulated benefit obligation	$ 6,084	$ 6,842

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- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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