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Pension, OPEB and Savings Plans (Estimated Future Benefit Payments) (Details) $ in Millions | Dec. 31, 2021 USD ($)
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Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | $ 402
Payments Expected Year Two | 386
Payments Expected Year Three | 397
Payments Expected Year Four | 405
Payments Expected Year Five | 414
Payments Expected Thereafter | 2,154
Total Estimated Future Benefit Payments | 4,158
Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 82
Payments Expected Year Two | 82
Payments Expected Year Three | 82
Payments Expected Year Four | 81
Payments Expected Year Five | 80
Payments Expected Thereafter | 368
Total Estimated Future Benefit Payments | 775
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 10
Payments Expected Year Two | 12
Payments Expected Year Three | 14
Payments Expected Year Four | 17
Payments Expected Year Five | 19
Payments Expected Thereafter | 136
Total Estimated Future Benefit Payments | 208
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Other Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Payments Expected Next Twelve Months | 9
Payments Expected Year Two | 11
Payments Expected Year Three | 13
Payments Expected Year Four | 14
Payments Expected Year Five | 16
Payments Expected Thereafter | 104
Total Estimated Future Benefit Payments | $ 167

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