| **Income Taxes (Narrative) (Details) - USD ($) $ in Millions**                                                                                                                  | 3 Months Ended | 6 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Income Tax Footnote Disclosure [Line Items]**                                                                                                                                 |           |           |   |   |
| Effective tax rates                                                                                                                                                             | 26.90%         | 9.40%          | 19.60% | 20.70% |
| United States statutory tax rate                                                                                                                                                | 35.00%         | 35.00%         | 35.00% | 35.00% |
| Excess Tax Benefit from Share-based Compensation, Financing Activities                                                                                                          | $ 4            | $ 25           | $ 37 | $ 65 |
| Unrecognized tax benefits, period increase (decrease)                                                                                                                           | 10             |           | 18 |   |
| Gross unrecognized tax benefits                                                                                                                                                 | 349            |           | 349 |   |
| Amount of unrecognized tax benefits that would affect the effective tax rate                                                                                                    | 322            |           | 322 |   |
| 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 |           |           | 28 |   |
| Unrecognized tax benefits income tax penalties and interest accrued increase (decrease)                                                                                         | 1              |           | 2 |   |
| Combined amount of accrued interest and penalties related to uncertain tax positions                                                                                            | 16             |           | 16 |   |
| 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                                                | $ 67           |           | $ 67 |   |

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[Line Items] for Income Tax Footnote Disclosure [Table]
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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
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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
Amount of cash inflow from 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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| - Definition
Amount of unrecognized tax benefits.
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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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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.
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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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