Employee Benefit Plans - PAC - Plan Assumptions (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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%
Other Postretirement | PAC
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.90%	2.50%	3.20%
Discount rate	2.50%	3.20%	4.25%
Expected return on plan assets	2.90%	4.92%	6.86%
United States | Pension
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.98%	2.60%	3.32%
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%
United States | Pension | PAC
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.90%	2.50%	3.25%
Discount rate	2.50%	3.25%	4.25%
Expected return on plan assets	6.00%	6.50%	7.00%
United States | Pension | PAC | Nonunion pension plan participant
Defined Benefit Plan Disclosure [Line Items]
Interest crediting rates for cash balance plan, year one	0.82%	2.27%	3.40%
Interest crediting rates for cash balance plan, year two	0.88%	0.82%	2.27%
Interest crediting rates for cash balance plan, year three	0.88%	0.82%	2.27%
Interest crediting rates for cash balance plan, year four	1.90%	2.00%	2.10%
Interest crediting rates for cash balance plan, year five		2.00%	2.10%
Interest crediting rates for cash balance plan, year six			2.10%
United States | Pension | PAC | Union pension plan participant
Defined Benefit Plan Disclosure [Line Items]
Interest crediting rates for cash balance plan, year one	1.42%	2.16%	3.15%
Interest crediting rates for cash balance plan, year two	1.94%	1.42%	2.16%
Interest crediting rates for cash balance plan, year three	1.94%	1.42%	2.16%
Interest crediting rates for cash balance plan, year four	2.30%	2.40%	2.70%
Interest crediting rates for cash balance plan, year five		2.40%	2.70%
Interest crediting rates for cash balance plan, year six			2.70%