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Postretirement Benefits Postretirement Benefits - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Health Care Cost Trend Rate for Next Year | 5.70% | 5.80% |
Rate to Which the Cost Trend Rate is Assumed to Decline (the Ultimate Trend Rate) | 4.50% | 4.50% |
Year Rate Reaches the Ultimate Trend Rate | 2037 | 2037 |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Total | 100.00% | 100.00% |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Total | 100.00% |  |
Pension Plans [Member] |  |  |
Defined Benefit Plan, Weighted average assumptions used to determine pension and other postretirement benefit obligations [Abstract] |  |  |
Discount Rate | 4.00% | 4.40% |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Discount Rate | 3.58% | 3.95% | 4.85%
Long-Term Rate of Return on Plan Assets | 5.25% | 6.00% | 6.25%
Other Postretirement Benefit Plans [Member] |  |  |
Defined Benefit Plan, Weighted average assumptions used to determine pension and other postretirement benefit obligations [Abstract] |  |  |
Discount Rate | 3.93% | 4.23% |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Discount Rate | 3.30% | 3.75% | 4.40%
United States Equity Securities [Member] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Total | 19.00% | 17.00% |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Total | 17.00% |  |
International Equity Securities [Member] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Total | 3.00% | 3.00% |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Total | 3.00% |  |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Total | 75.00% | 77.00% |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Total | 80.00% |  |
Short-Term Investments [Member] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] |  |  |
Total | 3.00% | 3.00% |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Total | 0.00% |  |

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- Definition Defined Benefit Plan, Actual Plan Asset Allocations [Abstract] + 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 interest rate used to adjust for the time value of money. + 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 An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: 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=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 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 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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- 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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