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Pension and Other Benefit Plans - Fair Value by Investment Category and Level Within Fair Value Hierarchy (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 6,895	$ 7,318	$ 7,636
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	180	402
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,121	5,687
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,594	1,229	$ 1,201
Global/International Equity commingled funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	673	683
Global/International Equity commingled funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	21
Global/International Equity commingled funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	652	662
Global/International Equity commingled funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S./North American Equity commingled funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	5
U.S./North American Equity commingled funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	5
U.S./North American Equity commingled funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S./North American Equity commingled funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Government funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	79	29
Non-U.S. Government funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	0
Non-U.S. Government funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	76	29
Non-U.S. Government funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fixed income commingled funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	361	218
Fixed income commingled funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	38	1
Fixed income commingled funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	323	205
Fixed income commingled funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	12
Fixed income mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Fixed income mutual funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Fixed income mutual funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Fixed income mutual funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Corporate and other bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,146	3,769
Corporate and other bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	0
Corporate and other bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,145	3,678
Corporate and other bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	91
Other Alternatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,263	1,961
Other Alternatives | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Other Alternatives | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	783	943
Other Alternatives | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,480	1,018
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37	56
Hedge Funds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Hedge Funds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	8
Hedge Funds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37	48
Other Assets
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	96	114
Other Assets | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	28
Other Assets | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19	26
Other Assets | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	77	60
Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	111	91
Insurance contracts | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Insurance contracts | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	111	91
Insurance contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	124	392
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	112	347
Cash and cash equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12	45
Cash and cash equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(02)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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