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Pension, Other Postretirement Benefits (OPEB) and Savings Plans - Fair Value Measurements and Levels of Inputs Used In Determining Fair Values (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [1] | $ 4,394 | $ 4,578
Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 490 | 433
Quoted Market Prices of Identical Assets (Level 1) | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 37 | 34
Significant Other Observable Inputs (Level 2) | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 453 | 399
Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [2] | 21 | 39
Cash and Cash Equivalents [Member] | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 2 | 2
Cash and Cash Equivalents [Member] | Quoted Market Prices of Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [2] | 13 | 39
Cash and Cash Equivalents [Member] | Quoted Market Prices of Identical Assets (Level 1) | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 2 | 2
Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 8 | 0
Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 | 0
Common Stock [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [3] | 661 | 748
Common Stock [Member] | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [4] | 35 | 32
Common Stock [Member] | Quoted Market Prices of Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [3] | 661 | 748
Common Stock [Member] | Quoted Market Prices of Identical Assets (Level 1) | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [4] | 35 | 32
Common Stock [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 | 0
Common Stock [Member] | Significant Other Observable Inputs (Level 2) | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [4] | 0 | 0
Commingled Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [5] | 1,916 | 1,376
Commingled Equities [Member] | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [6] | 334 | 294
Commingled Equities [Member] | Quoted Market Prices of Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 | 0
Commingled Equities [Member] | Quoted Market Prices of Identical Assets (Level 1) | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [6] | 0 | 0
Commingled Equities [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [5] | 1,916 | 1,376
Commingled Equities [Member] | Significant Other Observable Inputs (Level 2) | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [6] | 334 | 294
US Treasury Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [7] | 1,099 | 1,299
US Treasury Securities [Member] | Quoted Market Prices of Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 | 0
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [7] | 1,099 | 1,299
Commingled Debt [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [7] | 6 | 4
Commingled Debt [Member] | Quoted Market Prices of Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [7] | 6 | 4
Commingled Debt [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0 | 0
Subtotal before Measured at Net Asset Value Practical Expedient [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, subtotal |  | 3,703 | 3,466
Subtotal before Measured at Net Asset Value Practical Expedient [Member] | Quoted Market Prices of Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, subtotal |  | 680 | 791
Subtotal before Measured at Net Asset Value Practical Expedient [Member] | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, subtotal |  | 3,023 | 2,675
Commingled Equities at NAV [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [8] | 382 | 745
Real Estate Investment [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [9] | 308 | 365
Private Equity [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 1 | 2
Commingled Bonds [Member] | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [6] | 119 | 105
Commingled Bonds [Member] | Quoted Market Prices of Identical Assets (Level 1) | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [6] | 0 | 0
Commingled Bonds [Member] | Significant Other Observable Inputs (Level 2) | Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | [6] | $ 119 | $ 105
[1] | Excludes net receivables of $6 million and $2 million as of December 31, 2024 and 2023, respectively, which consist of interest, dividends and receivables and payables related to pending securities sales and purchases. In addition, the table excludes cash and foreign currency of $1 million as of December 31, 2024.
[2] | The Collective Investment Fund publishes a daily net asset value (NAV) which participants may use for daily redemptions without restrictions (Level 1).
[3] | Common stocks are measured using observable data in active markets and considered Level 1.
[4] | Common stocks are measured using observable data in active markets and considered Level 1.
[5] | Commingled Funds that publish daily NAV but with certain near-term redemption restrictions which prevent redemption at the published daily NAV are classified as Level 2.
[6] | Investments in commingled equity and bond funds have a readily determinable fair value as they publish a daily NAV available to investors which is the basis for current transactions and contain certain redemption restrictions requiring advance notice of one to two days for withdrawals (Level 2).
[7] | Debt securities include mainly U.S. Treasury obligations. These investments are valued using an evaluated pricing approach that varies by asset class and reflects observable market information such as the most recent exchange price or quoted bid for similar securities. Market-based standard inputs typically include benchmark yields, reported trades, broker/dealer quotes and issuer spreads or the most recent quotes for similar securities which are a Level 2 measure.
[8] | Certain commingled equity funds are not included in the fair value hierarchy as they are measured at fair value using the NAV per share (or its equivalent) practical expedient. These funds do not meet the definition of readily determinable fair value due to the frequency of publishing NAV (monthly). The objectives of these funds are mainly tracking the S&P Index or achieving long-term growth through investment in foreign equity securities and the Morgan Stanley Capital International Index.
[9] | The unlisted real estate fund invests in office, apartment, industrial and retail space. The fund is valued using the NAV per unit of funds. The investment value of the real estate properties is determined on a quarterly basis by independent market appraisers engaged by the board of directors of the fund. The ability to redeem funds is subject to the availability of cash arising from net investment income, allocations and the sale of investments in the normal course of business. The fund’s NAV is published quarterly. In addition, redemptions require one quarter advance notice prior to redemption and are fulfilled quarterly. The fund, therefore, does not meet the definition of readily determinable fair value. The purpose of the fund is to acquire, own, hold for investment and ultimately dispose of investments in real estate and real estate-related assets with the intention of achieving current income, capital appreciation or both.

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