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Pension Benefits - Schedule of Fair Value of Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ 459 | $ 525 |  |
Defined benefit plan, funded (unfunded) status of plan related to private equity | $ 260 |  |  |
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 | $ 14,979 | $ 18,504 | $ 17,022 | $ 15,608
Pension Benefits | U.S. Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 2,153 | 4,381 |  |
Pension Benefits | International Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,534 | 3,536 |  |
Pension Benefits | U.S. Government Issued Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 823 | 1,500 |  |
Pension Benefits | Corporate Bonds Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 4,961 | 3,936 |  |
Pension Benefits | Structured Assets Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 183 | 262 |  |
Pension Benefits | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,088 | 1,186 |  |
Pension Benefits | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 345 | 505 |  |
Pension Benefits | Futures |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | (1) | 2 |  |
Pension Benefits | Private Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,018 | 913 |  |
Pension Benefits | Real Estate and Other Alternatives |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 2,366 | 2,306 |  |
Pension Benefits | Hedge Funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 657 | 315 |  |
Pension Benefits | Total Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | (190) | (258) |  |
Pension Benefits | Pending Activities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 42 | (80) |  |
Pension Benefits | Fair Value, Inputs, Level 1 and 2 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 11,086 | 15,308 |  |
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 | (139) | (210) |  |
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 | 14,937 | 18,584 |  |
Pension Benefits | Level 1 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 3,754 | 7,999 |  |
Pension Benefits | Level 1 | U.S. Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 2,150 | 4,381 |  |
Pension Benefits | Level 1 | International Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,534 | 3,536 |  |
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 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 71 | 80 |  |
Pension Benefits | Level 1 | Futures |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | (1) | 2 |  |
Pension Benefits | Level 1 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | (48) | (110) |  |
Pension Benefits | Level 1 | Investments Excluding Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 3,706 | 7,889 |  |
Pension Benefits | Level 2 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 7,332 | 7,309 |  |
Pension Benefits | Level 2 | U.S. Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 3 | 0 |  |
Pension Benefits | Level 2 | U.S. Government Issued Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 823 | 1,500 |  |
Pension Benefits | Level 2 | Corporate Bonds Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 4,961 | 3,936 |  |
Pension Benefits | Level 2 | Structured Assets Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 183 | 262 |  |
Pension Benefits | Level 2 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,088 | 1,186 |  |
Pension Benefits | Level 2 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 274 | 425 |  |
Pension Benefits | Level 2 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | (91) | (100) |  |
Pension Benefits | Level 2 | Investments Excluding Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 7,241 | 7,209 |  |
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 | 4,041 | 3,534 |  |
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 | $ (51) | $ (48) |  |

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