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Employee Benefit Plans - Assumptions in Benefit Plans (Details) - Postretirement Benefits Other than Pensions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Weighted-average assumptions used to determine projected pension benefit obligations |  |  |
Discount rate (as a percent) | 4.30% | 4.25% | 4.00%
Discount rate beginning of year (as a percent) | 4.25% | 4.00% | 4.75%
Pre 65 |  |  |
Weighted-average assumptions used to determine projected pension benefit obligations |  |  |
Health care cost trend rate for medical benefits assumed for next year (as a percent) | 7.50% | 5.50% | 6.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (as a percent) | 4.50% | 4.50% | 4.50%
Year that the rate reaches the ultimate trend rate (pre-65) | 2023 | 2018 | 2018
Post 65 |  |  |
Weighted-average assumptions used to determine projected pension benefit obligations |  |  |
Health care cost trend rate for medical benefits assumed for next year (as a percent) | 5.00% | 5.50% | 6.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (as a percent) | 4.50% | 4.50% | 4.50%
Year that the rate reaches the ultimate trend rate (pre-65) | 2018 | 2018 | 2018

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- Definition The interest rate used to adjust for the time value of money for the plan at beginning of year. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the 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=65897934&loc=d3e1928-114920 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + 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 (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- References No definition available. + Details
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- Definition Year the ultimate health care cost trend rate is expected to be reached, in CCYY format. + 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 (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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