| **Income Taxes (Details) - USD ($) $ in Millions**                                                                     | 3 Months Ended | 6 Months Ended |        |
|------------------------------------------------------------------------------------------------------------------------|----------------|----------------|--------|
||
| **Income Tax Disclosure [Abstract]**                                                                                   |           |           |   |   |   |
| Unrecognized tax benefits                                                                                              | $ 352          |           | $ 352  |   | $ 328 |
| Accrued interest and penalties                                                                                         | $ 48           |           | $ 48   |   | $ 44 |
| Effective income tax rate reconciliation, percent                                                                      | 4.10%          | 8.20%          | 10.60% | 13.40% |   |
| Special charges, acquisition-related costs, adjustments to contingent consideration liabilities and discrete tax items | 13.20%         | 10.10%         | 6.50%  | 5.90% |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Effective Income Tax Rate Reconciliation, Special Charges, Acquisition Costs, Contingent Consideration Liabilities and Discrete Tax, Percent
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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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| X                                                                                                                                                                                                     |
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.
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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.
+ References
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