| **Accumulated Other Comprehensive Income/(Loss) (Details) - USD ($) $ in Millions** | 3 Months Ended | 6 Months Ended |
|-------------------------------------------------------------------------------------|----------------|----------------|
||
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                      |           |           |   |   |
| Balance at beginning of period                                                      | $ (724)        | $ (763)        | $ (897) | $ (364) |
| Other comprehensive income/(loss) before reclassifications                          | (71)           | 134            | 100 | (266) |
| Amounts reclassified from accumulated other comprehensive (income)/loss             | 4              | 1              | 6 | 2 |
| Other comprehensive income/(loss)                                                   | (67)           | 135            | 106 | (264) |
| Balance at end of period                                                            | (791)          | (628)          | (791) | (628) |
| Foreign currency translation                                                        |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                      |           |           |   |   |
| Balance at beginning of period                                                      | (725)          | (760)          | (897) | (359) |
| Other comprehensive income/(loss) before reclassifications                          | (65)           | 134            | 107 | (267) |
| Amounts reclassified from accumulated other comprehensive (income)/loss             | 0              | 0              | 0 | 0 |
| Other comprehensive income/(loss)                                                   | (65)           | 134            | 107 | (267) |
| Balance at end of period                                                            | (790)          | (626)          | (790) | (626) |
| Derivative financial instruments                                                    |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                      |           |           |   |   |
| Balance at beginning of period                                                      | 1              | (3)            | 0 | (5) |
| Other comprehensive income/(loss) before reclassifications                          | (4)            | 0              | (5) | 1 |
| Amounts reclassified from accumulated other comprehensive (income)/loss             | 4              | 1              | 6 | 2 |
| Other comprehensive income/(loss)                                                   | 0              | 1              | 1 | 3 |
| Balance at end of period                                                            | 1              | (2)            | 1 | (2) |
| Available-for-sale securities                                                       |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                      |           |           |   |   |
| Balance at beginning of period                                                      | 0              | 0              | 0 | 0 |
| Other comprehensive income/(loss) before reclassifications                          | (2)            | 0              | (2) | 0 |
| Amounts reclassified from accumulated other comprehensive (income)/loss             | 0              | 0              | 0 | 0 |
| Other comprehensive income/(loss)                                                   | (2)            | 0              | (2) | 0 |
| Balance at end of period                                                            | $ (2)          | $ 0            | $ (2) | $ 0 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.
+ References
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| - Definition
Amount after tax, before reclassification adjustments of other comprehensive income (loss).
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Amount after tax of other comprehensive income (loss) attributable to parent entity.
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Amount after tax of reclassification adjustments of other comprehensive income (loss).
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