| **Segment Information (Net Revenue By Geographic Area) (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 6 Months Ended |
|-------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Revenue from External Customer [Line Items]**                                                                   |           |           |   |   |
| Total net revenue                                                                                                 | $ 695          | $ 711          | $ 1,644 | $ 1,666 |
| North America                                                                                                     |           |           |   |   |
| **Revenue from External Customer [Line Items]**                                                                   |           |           |   |   |
| Net revenue from unaffiliated customers                                                                           | 303            | 329            | 698 | 779 |
| International                                                                                                     |           |           |   |   |
| **Revenue from External Customer [Line Items]**                                                                   |           |           |   |   |
| Net revenue from unaffiliated customers                                                                           | $ 392          | $ 382          | $ 946 | $ 887 |

| X                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.
+ References
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