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v3.25.1

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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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -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 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition 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. + References 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 + Details
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