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Commitments, Contingent Liabilities and Other Matters - Executive Agreements (Details) - Executive officers	12 Months Ended
	Dec. 31, 2018 executive_officer
Executive Agreements
Period of rolling term of employment agreements	1 year
Number of executive officers with severance benefit agreements	6

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- References

No definition available.

+ Details

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- Definition

Represents the period of rolling term of employment agreements.

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No definition available.

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- Definition

Supplemental Unemployment Benefits, Number of Individuals with Severance Benefit Agreements

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No definition available.

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- Details

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