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Pension And Other Postretirement Benefit Plans (Weighted-Average Target Pension Asset Allocation And Target Ranges By Major Asset Category) (Details) | Mar. 31, 2024 | Mar. 31, 2023
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Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 100.00% | 100.00%
Actual Allocation | 100.00% | 100.00%
Domestic Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 29.00% | 29.00%
Actual Allocation | 26.70% | 27.50%
Domestic Equity Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 19.00% | 19.00%
Domestic Equity Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 39.00% | 39.00%
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 66.00% | 66.00%
Actual Allocation | 67.30% | 66.00%
Fixed Income Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 56.00% | 56.00%
Fixed Income Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 76.00% | 76.00%
Real Estate Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 5.00% | 5.00%
Actual Allocation | 6.00% | 6.50%
Real Estate Funds [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 0.00% | 0.00%
Real Estate Funds [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 10.00% | 10.00%

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