| **Business Combinations Schedule of Variable Interest Entities (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended | 3 Months Ended | 12 Months Ended |        | 3 Months Ended | 12 Months Ended |        |        |        |        |        |        |        |
|---------------------------------------------------------------------------------------------------------------------------|-----------------|----------------|-----------------|--------|----------------|-----------------|--------|--------|--------|--------|--------|--------|--------|
||
| **Statement [Line Items]**                                                                                                |            |           |            |   |           |            |   |   |   |   |   |   |   |   |   |
| Cash and cash equivalents                                                                                                 |            |           | $ 25            | $ 41   |           | $ 14            | $ 33   |   |   |   |   |   |   |   |   |
| Other current assets                                                                                                      |            |           | 5               | 9      |           | 6               | 2      |   |   |   |   |   |   |   |   |
| Goodwill, acquired during the period                                                                                      | 407             | 82             | 82              |   | 83             | 83              |   |   |   |   |   |   |   |   |   |
| Indefinite-lived intangible assets, excluding goodwill                                                                    |            |           |            |   |           |            |   |   |   |   | 60     | 45     | 45     | 63 | 63 |
| Other intangible assets                                                                                                   |            |           |            |   |           |            |   | 54     | 7      | 7      |   |   |   |   |   |
| Other long-term assets                                                                                                    | 2               |           | 1               | 1      |           | 2               | 2      |   |   |   |   |   |   |   |   |
| Total assets                                                                                                              | 526             |           | 165             | 185    |           | 168             | 183    |   |   |   |   |   |   |   |   |
| Current liabilities                                                                                                       | 13              |           | 5               | 6      |           | 7               | 13     |   |   |   |   |   |   |   |   |
| Deferred income taxes, net                                                                                                |            |           | 19              | 19     |           | 23              | 23     |   |   |   |   |   |   |   |   |
| Other liabilities                                                                                                         |            |           |            |   |           | 4               | 5      |   |   |   |   |   |   |   |   |
| Total liabilities                                                                                                         |            |           | 24              | 25     |           | 34              | 41     |   |   |   |   |   |   |   |   |
| Noncontrolling interest                                                                                                   |            |           | $ 104           | $ 120  |           | $ 68            | $ 84   |   |   |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of assets acquired at the acquisition date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of intangible assets, excluding goodwill, acquired at the acquisition date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
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| - Definition
Amount of liabilities assumed at the acquisition date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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| - Definition
Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.
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| X                                                                                                                                                                   |
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