Pension, Other Postretirement Benefits (OPEB) and Savings Plans - Schedule of Expected Benefit Payments (Details) $ in Millions	Dec. 31, 2024 USD ($)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2025	$ 372
2026	333
2027	340
2028	346
2029	353
2030-2034	1,792
Total Estimated Future Benefit Payments	3,536
Pension Benefits [Member] \| Long Island Electric Utility Servco LLC Pension and OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
2025	17
2026	20
2027	23
2028	25
2029	28
2030-2034	181
Total Estimated Future Benefit Payments	294
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2025	73
2026	71
2027	69
2028	67
2029	64
2030-2034	272
Total Estimated Future Benefit Payments	616
Other Benefits [Member] \| Long Island Electric Utility Servco LLC Pension and OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
2025	14
2026	16
2027	18
2028	20
2029	22
2030-2034	140
Total Estimated Future Benefit Payments	$ 230

Defined Benefit Plan Expected Future Benefit Payments Total

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Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

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

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