Employee Benefit Plans - MEC - Defined Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension | MEC
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 1		$ 10
Settlement gain (loss)		$ 3	(4)
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	0	0	0
Settlement gain (loss)	0	0	0
Other Postretirement | MEC
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	0	0	0
Settlement gain (loss)	$ 0	$ 0	$ 0