Employee Benefit Plans - MEC - Plan Assumptions (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Healthcare cost trend rate assumed for next year	6.00%	6.30%
Rate that the cost trend rate gradually declines to	5.00%	5.00%
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.95%	2.59%	3.24%
Discount rate	2.59%	3.24%	4.21%
Expected return on plan assets	3.35%	5.42%	6.39%
MEC
Defined Benefit Plan Disclosure [Line Items]
Healthcare cost trend rate assumed for next year	5.90%	6.20%
Rate that the cost trend rate gradually declines to	5.00%	5.00%
Year that the rate reaches the rate it is assumed to remain at	2025	2025
MEC | Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.95%	2.65%	3.20%
Discount rate	2.65%	3.20%	4.15%
Expected return on plan assets	4.00%	6.00%	6.25%
United States | Pension
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.98%	2.60%	3.32%
Rate of compensation increase	2.75%	2.75%	2.75%
Interest crediting rates for cash balance plan, year one	2.45%	2.44%	3.22%
Interest crediting rates for cash balance plan, year two	2.56%	2.25%	2.94%
Interest crediting rates for cash balance plan, year three	2.56%	2.25%	2.94%
Interest crediting rates for cash balance plan, year four	2.83%	2.65%	3.02%
Interest crediting rates for cash balance plan, year five		2.65%	3.02%
Interest crediting rates for cash balance plan, year six			3.02%
Discount rate	2.60%	3.32%	4.25%
Expected return on plan assets	5.39%	5.94%	6.48%
Rate of compensation increase	2.75%	2.75%	2.75%
Interest crediting rates for cash balance plan	2.45%	2.44%	3.22%
United States | MEC | Pension
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.05%	2.75%	3.40%
Rate of compensation increase	2.75%	2.75%	2.75%
Interest crediting rates for cash balance plan, year one	1.19%	2.27%	3.40%
Interest crediting rates for cash balance plan, year two	1.19%	0.99%	2.27%
Interest crediting rates for cash balance plan, year three	1.19%	0.99%	2.27%
Interest crediting rates for cash balance plan, year four	1.19%	0.99%	2.27%
Interest crediting rates for cash balance plan, year five		0.99%	2.27%
Interest crediting rates for cash balance plan, year six			2.27%
Discount rate	2.75%	3.40%	4.25%
Expected return on plan assets	5.60%	6.25%	6.50%
Rate of compensation increase	2.75%	2.75%	2.75%
Interest crediting rates for cash balance plan	1.19%	2.27%	3.40%
After-tax | MEC | Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	2.39%	4.62%	4.62%