| **Income Taxes (Narrative) (Details) (USD $)In Millions, unless otherwise specified**                                                                                           | 3 Months Ended | 9 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Income Tax Footnote Disclosure [Line Items]**                                                                                                                                 |           |           |   |   |
| Effective tax rates                                                                                                                                                             | 3.40%          | 36.40%         | 8.80% | 17.80% |
| United States statutory tax rate                                                                                                                                                | 35.00%         | 35.00%         | 35.00% | 35.00% |
| Unrecognized tax benefits, period increase (decrease)                                                                                                                           | $ 5            |           | $ 12 |   |
| Gross unrecognized tax benefits                                                                                                                                                 | 309            |           | 309 |   |
| Cash deposits to offset uncertain tax liabilities                                                                                                                               | 46             |           | 46 |   |
| Amount of unrecognized tax benefits that would affect the effective tax rate                                                                                                    | 111            |           | 111 |   |
| The total amount of unrecognized tax benefits that, if recognized, would result in adjustments to deferred tax assets with corresponding adjustments to the valuation allowance | 184            |           | 184 |   |
| Unrecognized tax benefits income tax penalties and interest accrued increase (decrease)                                                                                         | 1              |           | 3 |   |
| Combined amount of accrued interest and penalties related to uncertain tax positions                                                                                            | 26             |           | 26 |   |
| Maximum                                                                                                                                                                         |           |           |   |   |
| **Income Tax Footnote Disclosure [Line Items]**                                                                                                                                 |           |           |   |   |
| Amount of unrecognized tax benefits for which it is reasonably possible that there will be a reduction within the next 12 months                                                | $ 120          |           | $ 120 |   |

| X                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cash deposits to offset uncertain tax liabilities
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total amount of unrecognized tax benefits that, if recognized, would result in adjustments to deferred tax assets with corresponding adjustments to the valuation allowance
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                   |
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| - Definition
Unrecognized tax benefits income tax penalties and interest accrued increase decrease
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss).
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| - Definition
The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.
+ References
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| - Definition
The net amount of all increases and decreases in unrecognized tax benefits for the period.
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| - Definition
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.
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