Postretirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Sep. 30, 2024	Sep. 30, 2024
Retirement Benefits [Abstract]
Net actuarial gains (losses), amortization periods		15 years
Expected long-term rate of return on plan assets		6.30%
Maximum amortization period of unfunded actuarial liability	15 years
Expected additional contribution to funded pension plan		$ 15
Expected additional contribution to unfunded pension plan		9
Expected additional contribution to savings and defined contribution plans		$ 30

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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