| **Employee Retirement Benefits (Components Of Net Periodic Benefit Cost As Well As Other Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Income For Qualified Plan And SERP) (Details) - USD ($) $ in Millions** | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
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| **Retirement Benefits [Abstract]**                                                                                                                                                                                                                |            |   |   |
| Service cost                                                                                                                                                                                                                                      | $ 10            | $ 9 | $ 8 |
| Interest cost                                                                                                                                                                                                                                     | 10              | 12 | 13 |
| Expected return on plan assets                                                                                                                                                                                                                    | (21)            | (21) | (20) |
| Amortization of actuarial loss and prior service cost                                                                                                                                                                                             | 6               | 3 | 1 |
| Other                                                                                                                                                                                                                                             | 1               | 3 | 1 |
| Net periodic benefit cost                                                                                                                                                                                                                         | 6               | 6 | 3 |
| Current year actuarial (gain) loss                                                                                                                                                                                                                | (62)            | 38 | (5) |
| Amortization of actuarial loss                                                                                                                                                                                                                    | (7)             | (6) | (2) |
| Current year prior service cost                                                                                                                                                                                                                   | 1               | 0 | 0 |
| Total recognized in other comprehensive (income) loss                                                                                                                                                                                             | (68)            | 32 | (7) |
| Total recognized in net periodic benefit cost and other comprehensive (income) loss                                                                                                                                                               | $ (62)          | $ 38 | $ (4) |

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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of actuarial gains or losses and prior service cost or credit recognized in net periodic benefit cost.
+ References
No definition available.
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| - Definition
Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.
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| - Definition
Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.
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| - Definition
Amount of cost recognized for passage of time related to defined benefit plan.
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| - Definition
Amount of net periodic benefit cost (credit) for defined benefit plan.
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| - Definition
Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment.
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| - Definition
Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.
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| - Definition
Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).
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| - Definition
Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.
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| - Definition
Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.
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| - Definition
Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.
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