Retirement Benefits - Weighted-average allocation of the majority of the assets related to defined benefit plans (Details)	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Equity securities (as a percent)	100.00%	100.00%
U.S. defined benefit plans
Defined Benefit Plan Disclosure [Line Items]
Other investments (as a percent)	74.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Equity securities (as a percent)	44.00%	45.00%
Debt securities (as a percent)	41.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Equity securities (as a percent)	49.00%	47.00%
Debt securities (as a percent)	47.00%
Other investments
Defined Benefit Plan Disclosure [Line Items]
Equity securities (as a percent)	7.00%	8.00%
Debt securities (as a percent)	12.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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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
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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

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-Publisher FASB
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Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

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