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Pension and Postretirement Benefit Plans and Defined Contribution Plans - Weighted-Average Actuarial Assumptions (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Postretirement Benefits Plan [Member] |  |  |  |
Weighted-average assumptions used to determine benefit obligations: |  |  |  |
Weighted-average assumptions used to determine benefit obligations, Discount rate |  | 4.30% | 3.70% | 4.20%
Weighted-average assumptions used to determine net periodic benefit cost: |  |  |  |
Weighted-average assumptions used to determine net periodic benefit cost, Discount rate |  | 3.70% | 4.20% | 4.50%
Weighted-average assumptions used to determine net periodic benefit cost, Expected return on plan assets |  | 7.50% | 8.00% | 8.00%
United States [Member] | Pension Plan [Member] |  |  |  |
Weighted-average assumptions used to determine benefit obligations: |  |  |  |
Weighted-average assumptions used to determine benefit obligations, Discount rate |  | 4.40% | 3.80% | 4.30%
Weighted-average assumptions used to determine benefit obligations, Rate of compensation increase | [1] | 0.00% | 2.80% | 2.80%
Weighted-average assumptions used to determine net periodic benefit cost: |  |  |  |
Weighted-average assumptions used to determine net periodic benefit cost, Discount rate |  | 3.80% | 4.30% | 4.50%
Weighted-average assumptions used to determine net periodic benefit cost, Expected return on plan assets |  | 7.50% | 8.00% | 8.00%
Weighted-average assumptions used to determine net periodic benefit cost, Rate of compensation increase |  | 2.80% | 2.80% | 2.80%
United States [Member] | U.S. Supplemental (Non-Qualified) Pension Plans [Member] |  |  |  |
Weighted-average assumptions used to determine benefit obligations: |  |  |  |
Weighted-average assumptions used to determine benefit obligations, Discount rate |  | 4.30% | 3.70% | 4.20%
Weighted-average assumptions used to determine benefit obligations, Rate of compensation increase | [1] | 0.00% | 2.80% | 2.80%
Weighted-average assumptions used to determine net periodic benefit cost: |  |  |  |
Weighted-average assumptions used to determine net periodic benefit cost, Discount rate |  | 3.70% | 4.20% | 4.50%
Weighted-average assumptions used to determine net periodic benefit cost, Rate of compensation increase |  | 2.80% | 2.80% | 2.80%
Foreign Plan [Member] | Pension Plan [Member] |  |  |  |
Weighted-average assumptions used to determine benefit obligations: |  |  |  |
Weighted-average assumptions used to determine benefit obligations, Discount rate |  | 2.50% | 2.30% | 2.40%
Weighted-average assumptions used to determine benefit obligations, Rate of compensation increase |  | 1.40% | 2.50% | 2.60%
Weighted-average assumptions used to determine net periodic benefit cost: |  |  |  |
Weighted-average assumptions used to determine interest cost, Discount rate | [2] | 2.00% | 2.10% | 2.70%
Weighted-average assumptions used to determine service cost, Discount rate | [2] | 2.30% | 2.30% | 3.00%
Weighted-average assumptions used to determine net periodic benefit cost, Expected return on plan assets |  | 4.40% | 4.70% | 5.20%
Weighted-average assumptions used to determine net periodic benefit cost, Rate of compensation increase |  | 2.50% | 2.60% | 2.60%
[1] | Effective January 1, 2018, we froze the defined benefit plans to future benefit accruals in the U.S. and members’ accrued benefits to that date no longer increase in line with future compensation increases. The rate of compensation increase is therefore no longer an assumption used to determine the benefit obligation.
[2] | Effective January 1, 2016, the Company changed the approach used to measure service cost and interest costs for certain international pension plans and other postretirement benefits. In accordance with this change, the effective rate for interest on the benefit obligations and effective rate for service cost, respectively, are reported for international pension plans.

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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