| **Employee Retirement Benefits (Weighted-Average Assumptions Used) (Details)**             | 12 Months Ended |
|--------------------------------------------------------------------------------------------|-----------------|
||
| Pension Plan                                                                               |            |   |   |
| **Weighted average assumptions used to determine benefit obligations**                     |            |   |   |
| Benefit obligation discount rate                                                           | 2.97%           | 2.68% |   |
| **Summary of the weighted average assumtions used to determine net periodic benefit cost** |            |   |   |
| Discount rate                                                                              | 2.68%           | 3.40% | 4.34% |
| Expected return on plan assets                                                             | 7.00%           | 7.00% | 7.00% |
| Pension Plan | Minimum                                                                     |            |   |   |
| **Weighted average assumptions used to determine benefit obligations**                     |            |   |   |
| Benefit obligation rate of compensation increase                                           | 2.25%           | 2.25% |   |
| **Summary of the weighted average assumtions used to determine net periodic benefit cost** |            |   |   |
| Rate of compensation increase                                                              | 2.25%           | 2.25% | 2.25% |
| Pension Plan | Maximum                                                                     |            |   |   |
| **Weighted average assumptions used to determine benefit obligations**                     |            |   |   |
| Benefit obligation rate of compensation increase                                           | 3.25%           | 3.25% |   |
| **Summary of the weighted average assumtions used to determine net periodic benefit cost** |            |   |   |
| Rate of compensation increase                                                              | 3.25%           | 3.25% | 3.25% |
| Supplemental Employee Retirement Plan                                                      |            |   |   |
| **Weighted average assumptions used to determine benefit obligations**                     |            |   |   |
| Benefit obligation discount rate                                                           | 2.90%           | 2.52% |   |
| **Summary of the weighted average assumtions used to determine net periodic benefit cost** |            |   |   |
| Discount rate                                                                              | 2.52%           | 3.33% | 4.25% |
| Supplemental Employee Retirement Plan | Minimum                                            |            |   |   |
| **Weighted average assumptions used to determine benefit obligations**                     |            |   |   |
| Benefit obligation rate of compensation increase                                           | 2.25%           | 2.25% |   |
| **Summary of the weighted average assumtions used to determine net periodic benefit cost** |            |   |   |
| Rate of compensation increase                                                              | 2.25%           | 2.25% | 2.25% |
| Supplemental Employee Retirement Plan | Maximum                                            |            |   |   |
| **Weighted average assumptions used to determine benefit obligations**                     |            |   |   |
| Benefit obligation rate of compensation increase                                           | 3.25%           | 3.25% |   |
| **Summary of the weighted average assumtions used to determine net periodic benefit cost** |            |   |   |
| Rate of compensation increase                                                              | 3.25%           | 3.25% | 3.25% |

| 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.
+ References
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.
+ References
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.
+ References
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920
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| X                                                                                                                                                               |
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| X                                                                                                                       |
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