| **Income Taxes (Narrative) (Details) - USD ($) $ in Millions**                                                                   | 3 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Income Tax Footnote Disclosure [Line Items]**                                                                                  |           |   |
| Effective tax rates                                                                                                              | 14.00%         | 20.30% |
| United States statutory tax rate                                                                                                 | 35.00%         |   |
| 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 | $ 55           |   |
| Increase to net cash provided by Operating Activities [Member]                                                                   |           |   |
| **Income Tax Footnote Disclosure [Line Items]**                                                                                  |           |   |
| Excess Tax Benefit from Share-based Compensation, Operating Activities                                                           |           | $ 33 |
| Excluding excess tax benefit [Member]                                                                                            |           |   |
| **Income Tax Footnote Disclosure [Line Items]**                                                                                  |           |   |
| Effective tax rates                                                                                                              | 19.20%         |   |
| Provision for income taxes [Member] | Increase to net cash provided by Operating Activities [Member]                             |           |   |
| **Income Tax Footnote Disclosure [Line Items]**                                                                                  |           |   |
| Excess Tax Benefit from Share-based Compensation, Operating Activities                                                           | $ 39           |   |

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[Line Items] for Income Tax Footnote Disclosure [Table]
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| - Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss).
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| - Definition
Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.
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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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