Employee Benefit Plans - MEC - Asset Allocations (Details) - MEC	Dec. 31, 2023
Minimum | Pension | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	40.00%
Minimum | Pension | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	30.00%
Minimum | Other Postretirement | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	25.00%
Minimum | Other Postretirement | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	65.00%
Maximum | Pension | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	60.00%
Maximum | Pension | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	60.00%
Maximum | Pension | Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	15.00%
Maximum | Other Postretirement | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	35.00%
Maximum | Other Postretirement | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	75.00%
Maximum | Other Postretirement | Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation percentage	5.00%