| **Employee Retirement Benefits (Narrative) (Details) (USD $)In Millions, except Share data, unless otherwise specified** | 12 Months Ended |        |        | 12 Months Ended | 3 Months Ended | 12 Months Ended |        |        | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------|-----------------|--------|--------|-----------------|----------------|-----------------|--------|--------|-----------------|
||
| **Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]**                           |            |   |   |            |           |            |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Minimum participant age to elect                                                                                         |            |   |   | 40 years        |           |            |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Benefits paid                                                                                                            | $ 28            | $ 15   |   |            |           |            |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Matching contributions for 401(k) plan                                                                                   | 10              | 9      | 8      |            |           |            |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total recognized in net periodic benefit cost and other comprehensive income                                             | 63              | (31)   | (38)   |            |           |            |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Amortization of actuarial loss                                                                                           | 2               |   |   |            |           |            |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Amortization of prior service cost                                                                                       | 1               |   |   |            |           |            |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Matching contribution to defined contribution plan                                                                       |            |   |   |            |           |            |   |   |            |   |   |   |   |   | 6.00% |   |   |   |   |   |   |   |   |   |   |
| Defined Contribution Plan, Requisite Service Period                                                                      | 3 years         |   |   |            |           |            |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Accrued employee benefit                                                                                                 |            |   |   |            |           |            |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   | 9 | 9 |   |   |
| Percentage of decrease in discount rate                                                                                  |            |   |   |            |           |            |   |   |            |   |   |   |   |   |   |   |   |   | 0.95% | 0.90% |   |   |   | 0.85% | 0.80% |
| Allocation percentage of investments                                                                                     |            |   |   |            | 80.00%         | 22.00%          | 22.00% | 12.00% | 12.00%          | 10.00% | 12.00% | 8.00% |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Pension plan assets at fair value                                                                                        | 280             | 238    | 216    |            |           |            |   |   |            |   |   |   | 19 | 3 |   |   |   |   |   |   |   |   |   |   |   |
| Pension plan assets, shares                                                                                              |            |   |   |            |           |            |   |   |            |   |   |   |   |   |   |   | 467,113 | 567,113 |   |   |   |   |   |   |   |
| Pension plan assets, fair value                                                                                          |            |   |   |            |           |            |   |   |            |   |   |   |   |   |   |   | 24 | 22 |   |   |   |   |   |   |   |
| Pension plan assets, sold shares                                                                                         |            |   |   |            |           |            |   |   |            |   |   |   |   |   |   |   | 100,000 |   |   |   |   |   |   |   |   |
| Pension plan assets, entity's shares sold, gain                                                                          |            |   |   |            |           |            |   |   |            |   |   |   |   |   |   |   | 5 |   |   |   |   |   |   |   |   |
| Cash dividends paid                                                                                                      | 270             | 263    | 261    |            |           |            |   |   |            |   |   |   |   |   |   |   | 1 | 1 |   |   |   |   |   |   |   |
| Expected contribution by employer during 2013                                                                            |            |   |   |            |           |            |   |   |            |   |   |   |   |   |   | $ 5 |   |   |   |   | $ 2 |   |   |   |   |
| Defined Benefit Plan, Actual Return on Plan Assets Still Held                                                            | 24.00%          |   |   |            |           |            |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Change in discount rate assumption.
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| X                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of cash issued to participants as the employers' matching contribution to the Company's 401(k) plan.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period, Number of Shares
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined benefit plan shares sold related to entity, gain.
+ References
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| X                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Age at which participants could elect to remain in the defined benefit plan as of August 31, 2008.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Benefit Plan, Total Recognized in Net Periodic Benefit Costs and Other Comprehensive Income, before Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Contribution Plan Matching Percent Of Compensation
+ References
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| X                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Contribution Plan, Requisite Service Period
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of employer securities or securities of parties related to the employer that are included in plan assets.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of employer shares or related party shares included in plan assets.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Target allocation of investments of this type to total plan assets presented on a weighted average basis.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
+ References
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