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Retirement Benefits - Assumptions for Determining Projected Benefit Obligation and Net Periodic Cost of Defined Benefit Pension Plans (Details) - Defined Benefit Pension Plans - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effect of change in assumptions used in calculations |  |  |
Increase in plan liability, if discount rate were reduced by 25 basis points | $ 57 |  |
U.S. |  |  |
For determining net periodic cost for the year: |  |  |
Discount rates (as a percent) |  |  | 1.95%
Expected long-term rates of return on assets (as a percent) |  |  | 2.95%
Minimum | Non-U.S. |  |  |
For determining projected benefit obligation at year-end: |  |  |
Discount rates (as a percent) | 1.90% | 1.90% | 2.35%
Rates of increase in compensation levels (as a percent) | 2.25% | 2.25% | 2.25%
For determining net periodic cost for the year: |  |  |
Discount rates (as a percent) | 1.90% | 1.90% | 2.20%
Rates of increase in compensation levels (as a percent) | 2.25% | 2.25% | 2.25%
Expected long-term rates of return on assets (as a percent) | 1.90% | 4.30% | 4.90%
Maximum |  |  |
Estimated future employer contributions to defined benefit pension plans |  |  |
Expected contributions in next fiscal year | $ 25 |  |
Maximum | Non-U.S. |  |  |
For determining projected benefit obligation at year-end: |  |  |
Discount rates (as a percent) | 5.50% | 5.00% | 5.50%
Rates of increase in compensation levels (as a percent) | 7.00% | 7.00% | 7.00%
For determining net periodic cost for the year: |  |  |
Discount rates (as a percent) | 5.00% | 5.50% | 5.00%
Rates of increase in compensation levels (as a percent) | 7.00% | 7.00% | 8.00%
Expected long-term rates of return on assets (as a percent) | 7.40% | 7.00% | 7.00%

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- Definition The effect on the defined benefit plan obligation of a 25 basis-point decrease in the interest rate. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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. + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + 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 (g) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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