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Postretirement Benefit Plans - Weighted Average Allocations (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Fixed income securities and cash equivalents | U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation (in percent) | 70.00% | 65.00%
Fixed income securities and cash equivalents | U.S. | Retiree health care plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation (in percent) | 65.00% | 65.00%
Fixed income securities and cash equivalents | Non-U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation (in percent) | 76.00% | 73.00%
Fixed income securities and cash equivalents | Minimum | U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 65.00% |
Fixed income securities and cash equivalents | Minimum | U.S. | Retiree health care plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 65.00% |
Fixed income securities and cash equivalents | Minimum | Non-U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 60.00% |
Fixed income securities and cash equivalents | Maximum | U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 80.00% |
Fixed income securities and cash equivalents | Maximum | U.S. | Retiree health care plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 80.00% |
Fixed income securities and cash equivalents | Maximum | Non-U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 100.00% |
Equity securities | U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation (in percent) | 30.00% | 35.00%
Equity securities | U.S. | Retiree health care plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation (in percent) | 35.00% | 35.00%
Equity securities | Non-U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual plan asset allocation (in percent) | 24.00% | 27.00%
Equity securities | Minimum | U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 20.00% |
Equity securities | Minimum | U.S. | Retiree health care plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 20.00% |
Equity securities | Minimum | Non-U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 0.00% |
Equity securities | Maximum | U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 35.00% |
Equity securities | Maximum | U.S. | Retiree health care plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 35.00% |
Equity securities | Maximum | Non-U.S. | Defined benefit plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Targeted allocation (in percent) | 40.00% |

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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