Other Income (Expense) - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ 86	$ 116	$ (7)
MEC
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	83	36	0
MEC | Corporate-owned life insurance income (loss)
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	29	23	(16)
MEC | Non-service cost components of postretirement employee benefit plans
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	8	8	9
MEC | Interest income and other, net
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ 46	$ 5	$ 7