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Pension and Other Benefit Plans - Pension Plan, Net Periodic Costs and Other Changes (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 52	$ 53	$ 73
Interest cost	300	307	254
Expected return on assets	(455)	(446)	(498)
Amortization of prior service credit	(5)	(6)	(7)
Subtotal	(108)	(92)	(178)
Settlement/curtailment (gain) loss	0	(2)	361
Recognition of actuarial (gain) loss	(232)	447	1,070
Net periodic pension (income) expense	$ (340)	$ 353	$ 1,253
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Discount or settlement rates	4.40%	4.50%	2.70%
Expected long-term rates of return on assets	6.30%	6.00%	4.30%
Rates of increase in compensation levels	2.40%	2.80%	2.90%
Interest Crediting Rate	2.70%	4.50%	4.00%
Employer contributions:
2026	$ 34
Benefit Payments:
2026	337
2027	340
2028	353
2029	361
2030	371
2031 and thereafter	1,982
Total	$ 3,744

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