| **Business Combinations Business Combinations (Narrative) (Details)In Millions, unless otherwise specified** | 6 Months Ended | 12 Months Ended |        |        |        | 12 Months Ended |        |        |        |        |        | 3 Months Ended | 12 Months Ended |        |        |        |        |        | 3 Months Ended | 6 Months Ended |        | 3 Months Ended | 6 Months Ended | 12 Months Ended |        | 6 Months Ended |
|--------------------------------------------------------------------------------------------------------------|----------------|-----------------|--------|--------|--------|-----------------|--------|--------|--------|--------|--------|----------------|-----------------|--------|--------|--------|--------|--------|----------------|----------------|--------|----------------|----------------|-----------------|--------|----------------|
||
| Net cash consideration                                                                                       |           | $ 292           |   |   |   | $ 171           | 160    |   |   |   |   |           |            |   | $ 121  |   |   |   |           |           |   |           |           |            |   |           |   |   |   |   |   |   |   |
| Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High                  |           |            |   |   |   |            |   | 168    |   | 150    |   |           |            |   |   | 65     |   |   |           |           |   |           |           |            |   |           |   |   |   |   |   |   |   |
| Business Combination, Contingent Consideration, Liability                                                    |           | 188             |   |   |   |            |   |   | 132    |   |   |           |            |   |   | 56     |   |   |           |           |   |           |           |            |   |           |   |   |   |   |   |   |   |
| Net assets acquired                                                                                          |           | 513             |   |   |   |            |   |   | 303    |   |   |           |            |   |   | 210    |   |   |           |           |   |           |           |            |   |           |   |   |   |   |   |   |   |
| Contingent Consideration Liability                                                                           |           |            | 206    | 198    | 195    |            |   |   |   |   | 148    | 141            | 139             |   |   |   |   | 58     | 57             | 56             |   |           |           |            |   |           |   |   |   |   |   |   |   |
| Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage                              |           |            |   |   |   |            |   |   |   |   |   |           |            |   |   | 18.00% |   |   |           |           |   |           |           | 19.00%          |   |           |   |   |   |   |   |   |   |
| Equity Interest, Total Ownership Percentage By All Other Investors                                           |           |            |   |   |   |            |   |   |   |   |   |           |            |   |   |   | 82.00% |   |           |           |   |           | 81.00%         |            |   |           |   |   |   |   |   |   |   |
| Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value                              |           | 33              |   |   |   | 0               |   |   |   |   |   |           |            | 33     | 33     |   |   |   |           |           |   |           |           |            |   |           |   |   |   |   |   |   |   |
| Equity Security Ownership Interest And Allocated Value For Purchase Option                                   |           |            |   |   |   |            |   |   |   |   |   |           |            |   |   |   |   |   |           |           |   |           |           | 60              |   |           |   |   | 40 |   |   |   |   |
| Noncontrolling Interest, Ownership Percentage by Parent                                                      |           |            |   |   |   |            |   |   |   |   |   |           |            |   |   |   |   |   |           |           |   |           |           |            |   |           |   |   | 19.00% |   |   |   |   |
| Additional Payment For Acquisition At Company Option                                                         |           |            |   |   |   |            |   |   |   |   |   |           |            |   |   |   |   |   |           |           |   |           |           | 375             |   |           |   |   | 300 |   |   |   |   |
| Variable Interest Entity, Financial or Other Support, Amount                                                 |           |            |   |   |   |            |   |   |   |   |   |           |            |   |   |   |   |   |           |           | 9      | 28             |           |            |   |           |   | 15 |   |   |   |   |   |
| Goodwill, Purchase Accounting Adjustments                                                                    |           |            |   |   |   |            |   |   |   |   |   |           |            |   |   |   |   |   |           |           |   |           |           |            |   | 36             | (36) |   |   |   |   |   | (36) |
| Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss                      |           |            |   |   |   |            |   |   |   |   |   |           |            |   |   |   |   |   |           |           |   | 29             |           |            |   |           |   |   |   |   |   |   |   |
| Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests                                  | 344            |            |   |   |   |            |   |   |   |   |   |           |            |   |   |   |   |   |           |           |   |           | 344            |            |   |           |   |   |   | 297 | 47 | 47 |   |
| Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs          |           |            |   |   |   |            |   |   |   |   |   |           |            |   |   |   |   |   |           |           |   |           | 18             |            |   |           |   |   |   |   |   |   |   |
| Business Combination, Consideration Transferred                                                              |           |            |   |   |   |            |   |   |   |   |   |           |            |   |   |   |   |   |           |           |   |           |           |            | $ 200  |           |   |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Additional payment for acquisition at our company's option.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity security ownership interest and allocated value for purchase option.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of voting equity interests acquired at the acquisition date in the business combination.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of liability recognized arising from contingent consideration in a business combination.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to equity interests acquired in connection with a business combination for which the initial accounting was incomplete.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
In a business combination achieved in stages, this element represents the amount of loss recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).
+ References
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| X                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The parent entity's interest in net assets of the subsidiary, expressed as a percentage.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of financial or other support the reporting entity has provided (explicitly or implicitly) to the Variable Interest Entity (VIE) that it was not previously contractually required to provide or that the reporting entity intends to provide, including, for example, situations in which the reporting entity assisted the VIE in obtaining another type of support.
+ References
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