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Retirement Benefits - Target and Weighted Average Actual Allocations and Benefit Pension Plans (Details) | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Target allocations and the weighted average actual allocations of plan assets |  |
Weighted average actual allocation (as a percent) | 100.00% | 100.00%
Debt securities |  |
Target allocations and the weighted average actual allocations of plan assets |  |
Weighted average actual allocation (as a percent) | 68.00% | 68.00%
Equity securities |  |
Target allocations and the weighted average actual allocations of plan assets |  |
Weighted average actual allocation (as a percent) | 25.00% | 26.00%
Other |  |
Target allocations and the weighted average actual allocations of plan assets |  |
Weighted average actual allocation (as a percent) | 7.00% | 6.00%
Minimum | Debt securities |  |
Target allocations and the weighted average actual allocations of plan assets |  |
Target allocation (as a percent) | 65.00% |
Minimum | Equity securities |  |
Target allocations and the weighted average actual allocations of plan assets |  |
Target allocation (as a percent) | 20.00% |
Minimum | Other |  |
Target allocations and the weighted average actual allocations of plan assets |  |
Target allocation (as a percent) | 0.00% |
Maximum | Debt securities |  |
Target allocations and the weighted average actual allocations of plan assets |  |
Target allocation (as a percent) | 75.00% |
Maximum | Equity securities |  |
Target allocations and the weighted average actual allocations of plan assets |  |
Target allocation (as a percent) | 30.00% |
Maximum | Other |  |
Target allocations and the weighted average actual allocations of plan assets |  |
Target allocation (as a percent) | 10.00% |
Defined Benefit Pension Plans | Non-U.S. | Direct investment in company common stock or debt securities |  |
Target allocations and the weighted average actual allocations of plan assets |  |
Weighted average actual allocation (as a percent) | 0.00% |
Defined Benefit Pension Plans | Maximum | Common or collective trusts |  |
Target allocations and the weighted average actual allocations of plan assets |  |
Redemption notice period to redeem investments | 30 days |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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