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Pension Plans and Other Postretirement Benefits - Fair Value of Pension Plan Assets (Details) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 5,379 | $ 5,346 | $ 6,677
Total Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4,352 | 4,299 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 81 | 88 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,406 | 3,403 |
Total Fair Value, Inputs, Level 1, 2 and 3 | U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 522 | 570 |
Total Fair Value, Inputs, Level 1, 2 and 3 | States, municipalities and political subdivisions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 94 | 102 |
Total Fair Value, Inputs, Level 1, 2 and 3 | U.S. corporate securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,649 | 2,611 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Foreign securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 106 | 101 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Residential mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 17 | 6 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Commercial mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 9 | 1 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Other asset-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 11 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Redeemable preferred securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 1 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Total equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 184 | 176 |
Total Fair Value, Inputs, Level 1, 2 and 3 | U.S. domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 150 | 133 |
Total Fair Value, Inputs, Level 1, 2 and 3 | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 34 | 43 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Other investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 681 | 632 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 290 | 325 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 405 | 307 |
Total Fair Value, Inputs, Level 1, 2 and 3 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | (14) |  |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 714 | 749 |
Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 12 | 7 |
Level 1 | Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 518 | 566 |
Level 1 | U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 518 | 566 |
Level 1 | States, municipalities and political subdivisions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | U.S. corporate securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Foreign securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Residential mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Commercial mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Other asset-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Redeemable preferred securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Total equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 184 | 176 |
Level 1 | U.S. domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 150 | 133 |
Level 1 | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 34 | 43 |
Level 1 | Other investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 1 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,348 | 3,225 |
Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 69 | 81 |
Level 2 | Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,888 | 2,837 |
Level 2 | U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4 | 4 |
Level 2 | States, municipalities and political subdivisions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 94 | 102 |
Level 2 | U.S. corporate securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,649 | 2,611 |
Level 2 | Foreign securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 106 | 101 |
Level 2 | Residential mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 17 | 6 |
Level 2 | Commercial mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 9 | 1 |
Level 2 | Other asset-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8 | 11 |
Level 2 | Redeemable preferred securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1 | 1 |
Level 2 | Total equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 | U.S. domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 | Other investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 391 | 307 |
Level 2 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 2 | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 405 | 307 |
Level 2 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | (14) |  |
Level 2 | Common/collective trusts, Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets, investment within plan asset category, amount | 114 | 104 |
Level 2 | Common/collective trusts, Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets, investment within plan asset category, amount | 291 | 203 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 290 | 325 |
Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | States, municipalities and political subdivisions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | U.S. corporate securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Foreign securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Residential mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Commercial mortgage-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Other asset-backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Redeemable preferred securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Total equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | U.S. domestic |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Other investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 290 | 325 |
Level 3 | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 290 | 325 | $ 378
Level 3 | Common/collective trusts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Level 3 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 |  |
Fair Value Measured at Net Asset Value Per Share | Other receivables |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 314 | 390 |
Fair Value Measured at Net Asset Value Per Share | Private equity investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 461 | 432 |
Fair Value Measured at Net Asset Value Per Share | Hedge fund investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 252 | $ 225 |

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