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Employee Benefit Plans - Health Care Cost Trend Rate (Details)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Pre-65 health care cost trend rate	6.50%	6.75%	6.90%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	4.50%	5.00%

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- Definition

Defined benefit plan health care cost trend rate assumed for pre retirement.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (l)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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