Post-Employment Benefits - Assumptions (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined benefit plans and medical and dental plans
Weighted average assumptions used to determine benefit obligations
Discount rate (as a percent)	2.70%	2.30%	3.00%
Expected aggregate average long-term change in compensation (as a percent)	4.30%	4.30%	4.30%
Weighted average assumptions used to determine the net cost
Discount rate (as a percent)	2.30%	3.00%	4.00%
Expected return on plan assets (as a percent)	7.50%	7.50%	7.50%
Expected aggregate average long-term change in compensation (as a percent)	4.30%	4.30%	4.30%
Medical and Dental Plans
Assumed health care cost trend rates
Health care cost trend rate assumed for the next year (as a percent)	7.00%	8.00%	9.00%
Rate that the cost trend rate gradually declines to (as a percent)	5.00%	5.00%	5.00%
Year that rate reaches the assumed ultimate rate	2026	2025	2025

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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- Definition

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

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- Definition

Year ultimate health care cost trend rate is expected to be reached, in YYYY format.

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