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v3.10.0.1

Share-based Compensation and Employee Benefits (Schedule of Weighted-Average Actuarial Assumptions) (Details) | 12 Months Ended
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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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