| **Income Taxes (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 6 Months Ended |         |
|---------------------------------------------------------------------------|----------------|----------------|---------|
||
| **Income Tax Disclosure [Abstract]**                                      |           |           |    |   |   |
| Unrecognized tax benefits                                                 | $ 321          |           | $ 321   |   | $ 315 |
| Accrued interest and penalties                                            | 40             |           | 40      |   | 37 |
| Effective Income Tax Rate Reconciliation, Percent                         | 8.20%          | (8.10%)        | 13.40%  | 8.40% |   |
| Unusual or Infrequent Item, Net (Gain) Loss                               | $ 82           |           | $ 118   |   |   |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Percent      | 10.10%         | 30.70%         | 5.90%   | 9.90% |   |
| Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent   | (1.10%)        |           | (1.20%) | 3.10% |   |

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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 the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of (gain) loss recognized in the income statement for an event or transaction that is unusual in nature or occurs infrequently, but not both.
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