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Litigation and Contingencies (Details) $ in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 29, 2023 USD ($) | Dec. 30, 2020 shareholder | Oct. 31, 2021 USD ($) mi | Jun. 30, 2018 party defendant | Sep. 30, 2017 recipient | Dec. 31, 2023 USD ($) entity unit mi | Sep. 30, 2022 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Settlement agreement, accrued |  |  |  |  |  |  | $ 103
Environmental remediation costs, estimate |  |  |  |  |  | $ 41 |
Number of general notice letter recipients | entity |  |  |  |  |  | 100 |
Number of operable units | unit |  |  |  |  |  | 4 |
Miles of river included in the remedial investigation and feasibility study | mi |  |  | 9 |  |  |  |
Loss contingency, estimate of possible loss |  |  | $ 441 |  |  |  |
Number of parties sued (in parties) | party |  |  |  | 100 |  |  |
Number of defendants | defendant |  |  |  | 42 |  |  |
Standby letters of credit outstanding |  |  |  |  |  | $ 38 |
Lower Half of River |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Miles of river included in the remedial investigation and feasibility study | mi |  |  |  |  |  | 17 |
Lower Passaic River Matter |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Miles of river included in the remedial investigation and feasibility study | mi |  |  |  |  |  | 8.3 |
Number of general notice letter recipients involved in remedial investigation and feasibility study | recipient |  |  |  |  | 80 |  |
Lower Passaic River Matter Selected Remedy for Preferred Alternative |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Settlement amount |  |  |  |  |  | $ 1,400 |
Weber Et Al V Polk Et Al | Pending Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of plaintiffs | shareholder |  | 2 |  |  |  |  |
Unfavorable Regulatory Action |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Civil penalty | $ 13 |  |  |  |  |  |

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