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Employee Benefit Plans - Assumptions, Additional Information (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets		6.60%	6.70%
Scenario, Forecast
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	6.60%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Market return expectation rate		60.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Market return expectation rate		40.00%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate		3.73%	4.22%
Expected long-term rate of return on plan assets		6.60%	6.70%	6.90%
Other postretirement obligations
Defined Benefit Plan Disclosure [Line Items]
Discount rate		3.55%	3.97%
Expected long-term rate of return on plan assets		6.60%	6.60%	6.90%

X

- 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

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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

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- Definition

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+ References

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/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

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