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Employee Benefit Plans - Change in Benefit Obligation (Details) - Other Postretirement Benefits Plan - Officer Medical Plan - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of the year	$ 127	$ 106	$ 114
Service cost	6	5	6
Interest cost	6	5	4
Net actuarial loss (gain)	41	17	(14)
Benefits paid	(6)	(6)	(4)
Benefit obligation, end of the year	$ 174	$ 127	$ 106

X

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

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-Section 50
-Paragraph 1
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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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- Definition

Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

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