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Pension Benefits - Schedule of Fair Value of Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ 583 | $ 524 |  |
Defined benefit plan, funded (unfunded) status of plan related to private equity | $ 180 |  |  |
Private Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | Fair Value Measured at Net Asset Value Per Share | Fair Value Measured at Net Asset Value Per Share |  |
Private Equity | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Period of sale of limited partnership interests in secondary market (in years) | 3 months |  |  |
Private Equity | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Period of sale of limited partnership interests in secondary market (in years) | 6 months |  |  |
Real Estate and Other Alternatives |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | Fair Value Measured at Net Asset Value Per Share | Fair Value Measured at Net Asset Value Per Share |  |
Hedge Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | Fair Value Measured at Net Asset Value Per Share | Fair Value Measured at Net Asset Value Per Share |  |
Period of liquidation (in years) | 18 months |  |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ 15,278 | $ 15,404 | $ 14,979 | $ 18,504
Pension Benefits | U.S. Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 2,752 | 2,475 |  |
Pension Benefits | International Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,508 | 1,584 |  |
Pension Benefits | U.S. Government Issued Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 619 | 615 |  |
Pension Benefits | Corporate Bonds Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 5,429 | 5,526 |  |
Pension Benefits | Structured Assets Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 159 | 132 |  |
Pension Benefits | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 783 | 735 |  |
Pension Benefits | Commingled Trust Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 478 | 475 |  |
Pension Benefits | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 343 | 338 |  |
Pension Benefits | Futures |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | (4) | 19 |  |
Pension Benefits | Private Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 975 | 1,031 |  |
Pension Benefits | Real Estate and Other Alternatives |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,609 | 1,876 |  |
Pension Benefits | Hedge Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 788 | 723 |  |
Pension Benefits | Total Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | (179) | (193) |  |
Pension Benefits | Pending Activities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 18 | 68 |  |
Pension Benefits | Fair Value, Inputs, Level 1 and 2 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 12,067 | 11,899 |  |
Pension Benefits | Fair Value, Inputs, Level 1 and 2 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | (140) | (148) |  |
Pension Benefits | Fair Value, Inputs, Level 1 and 2 | Investments Excluding Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 15,260 | 15,336 |  |
Pension Benefits | Level 1 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 4,307 | 4,113 |  |
Pension Benefits | Level 1 | U.S. Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 2,752 | 2,474 |  |
Pension Benefits | Level 1 | International Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,508 | 1,584 |  |
Pension Benefits | Level 1 | U.S. Government Issued Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Pension Benefits | Level 1 | Corporate Bonds Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Pension Benefits | Level 1 | Structured Assets Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Pension Benefits | Level 1 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Pension Benefits | Level 1 | Commingled Trust Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Pension Benefits | Level 1 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 51 | 36 |  |
Pension Benefits | Level 1 | Futures |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | (4) | 19 |  |
Pension Benefits | Level 1 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | (50) | (52) |  |
Pension Benefits | Level 1 | Investments Excluding Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 4,257 | 4,061 |  |
Pension Benefits | Level 2 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 7,760 | 7,786 |  |
Pension Benefits | Level 2 | U.S. Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 1 |  |
Pension Benefits | Level 2 | U.S. Government Issued Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 619 | 615 |  |
Pension Benefits | Level 2 | Corporate Bonds Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 5,429 | 5,526 |  |
Pension Benefits | Level 2 | Structured Assets Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 159 | 132 |  |
Pension Benefits | Level 2 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 783 | 735 |  |
Pension Benefits | Level 2 | Commingled Trust Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 478 | 475 |  |
Pension Benefits | Level 2 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 292 | 302 |  |
Pension Benefits | Level 2 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | (90) | (96) |  |
Pension Benefits | Level 2 | Investments Excluding Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 7,670 | 7,690 |  |
Pension Benefits | Fair Value Measured at Net Asset Value Per Share | Investments Valued Using NAV Per Share |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 3,372 | 3,630 |  |
Pension Benefits | Fair Value Measured at Net Asset Value Per Share | Funds For Retiree Health Benefits Measured At Net Asset Value |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ (39) | $ (45) |  |

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