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Employee Benefits Allocation of Plan Assets (Details) | 12 Months Ended |
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Dec. 31, 2016 | Dec. 31, 2015
Allocation of Plan Assets |  |
Defined Benefit Plan, Target Plan Asset Allocations | 100.00% |
Defined Benefit Plan, Actual Plan Asset Allocations | 100.00% | 100.00%
Equity securities |  |
Allocation of Plan Assets |  |
Defined Benefit Plan, Target Plan Asset Allocations | 24.00% |
Defined Benefit Plan, Actual Plan Asset Allocations | 23.00% | 22.00%
Fixed income securities |  |
Allocation of Plan Assets |  |
Defined Benefit Plan, Target Plan Asset Allocations | 29.00% |
Defined Benefit Plan, Actual Plan Asset Allocations | 26.00% | 38.00%
Real estate |  |
Allocation of Plan Assets |  |
Defined Benefit Plan, Target Plan Asset Allocations | 8.00% |
Defined Benefit Plan, Actual Plan Asset Allocations | 6.00% | 7.00%
Other plan assets |  |
Allocation of Plan Assets |  |
Defined Benefit Plan, Target Plan Asset Allocations | 39.00% |
Defined Benefit Plan, Actual Plan Asset Allocations | 45.00% | 33.00%

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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