| **Segment and Revenue Information - Net Revenue By Geographic Area (Details) - USD ($) $ in Millions** | 3 Months Ended | 9 Months Ended |
|--------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Revenue from External Customer [Line Items]**                                                        |           |           |   |   |
| Net revenue                                                                                            | $ 1,945        | $ 1,881        | $ 5,783 | $ 5,552 |
| North America                                                                                          |           |           |   |   |
| **Revenue from External Customer [Line Items]**                                                        |           |           |   |   |
| Net revenue                                                                                            | 777            | 801            | 2,331 | 2,357 |
| International                                                                                          |           |           |   |   |
| **Revenue from External Customer [Line Items]**                                                        |           |           |   |   |
| Net revenue                                                                                            | $ 1,168        | $ 1,080        | $ 3,452 | $ 3,195 |

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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| - 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).
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