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Share-based Compensation and Employee Benefits (Schedule of Weighted-Average Actuarial Assumptions) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Assumptions related to benefit obligations:
Discount rate	4.26%	3.56%	3.83%
Rate of compensation increase	3.50%	3.53%	3.52%
Assumptions related to benefit costs:
Expected return on plan assets	7.25%	7.07%	7.31%
Rate of compensation increase	3.50%	3.52%	3.51%
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
UBIT rate	21.00%	21.00%	21.00%
Assumptions related to benefit obligations:
Discount rate	4.16%	3.48%	3.69%
Assumptions related to benefit costs:
Expected return on plan assets	7.08%	6.84%	7.07%
Benefit obligation [Member] | Pension Benefits [Member]
Assumptions related to benefit costs:
Discount rate	3.56%	3.83%	4.05%
Benefit obligation [Member] | OPEB [Member]
Assumptions related to benefit costs:
Discount rate	3.48%	3.69%	3.91%
Discount rate for interest on benefit obligations [Member] | Pension Benefits [Member]
Assumptions related to benefit costs:
Discount rate	3.13%	3.09%	3.24%
Discount rate for interest on benefit obligations [Member] | OPEB [Member]
Assumptions related to benefit costs:
Discount rate	3.08%	3.05%	3.18%
Discount rate for service cost [Member] | Pension Benefits [Member]
Assumptions related to benefit costs:
Discount rate	3.56%	3.88%	4.15%
Discount rate for service cost [Member] | OPEB [Member]
Assumptions related to benefit costs:
Discount rate	3.82%	4.15%	4.36%
Discount rate for interest on service cost [Member] | Pension Benefits [Member]
Assumptions related to benefit costs:
Discount rate	3.14%	3.24%	3.50%
Discount rate for interest on service cost [Member] | OPEB [Member]
Assumptions related to benefit costs:
Discount rate	3.76%	3.95%	4.17%

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Unrelated Business Income Tax Rate

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- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- 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.

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- 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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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

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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.

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