| **Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in AOCI (Details) - USD ($) $ in Millions** | 3 Months Ended | 9 Months Ended |
|-------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**                                                  |           |           |   |  |   |
| Beginning balance                                                                                                 | $ (34)         | $ 137          | $ (67) | [1] | $ 15 |
| Other comprehensive income (loss) before reclassifications                                                        | (39)           | (113)          | 28 |  | 81 |
| Amounts reclassified from accumulated other comprehensive income (loss)                                           | (11)           | (61)           | (45) |  | (133) |
| Total other comprehensive income (loss), net of tax                                                               | (50)           | (174)          | (17) |  | (52) |
| Ending balance                                                                                                    | (84)           | (37)           | (84) |  | (37) |
| Unrealized Net Gains (Losses) on Available-for-Sale Securities                                                    |           |           |   |  |   |
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**                                                  |           |           |   |  |   |
| Beginning balance                                                                                                 | (1)            | (4)            | (1) |  | (3) |
| Other comprehensive income (loss) before reclassifications                                                        | 1              | 1              | 1 |  | 0 |
| Amounts reclassified from accumulated other comprehensive income (loss)                                           | 0              | 1              | 0 |  | 1 |
| Total other comprehensive income (loss), net of tax                                                               | 1              | 2              | 1 |  | 1 |
| Ending balance                                                                                                    | 0              | (2)            | 0 |  | (2) |
| Unrealized Net Gains (Losses) on Derivative Instruments                                                           |           |           |   |  |   |
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**                                                  |           |           |   |  |   |
| Beginning balance                                                                                                 | 54             | 246            | 13 |  | 47 |
| Other comprehensive income (loss) before reclassifications                                                        | (58)           | (137)          | 17 |  | 134 |
| Amounts reclassified from accumulated other comprehensive income (loss)                                           | (11)           | (62)           | (45) |  | (134) |
| Total other comprehensive income (loss), net of tax                                                               | (69)           | (199)          | (28) |  | 0 |
| Ending balance                                                                                                    | (15)           | 47             | (15) |  | 47 |
| Foreign Currency Translation Adjustments                                                                          |           |           |   |  |   |
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**                                                  |           |           |   |  |   |
| Beginning balance                                                                                                 | (87)           | (105)          | (79) |  | (29) |
| Other comprehensive income (loss) before reclassifications                                                        | 18             | 23             | 10 |  | (53) |
| Amounts reclassified from accumulated other comprehensive income (loss)                                           | 0              | 0              | 0 |  | 0 |
| Total other comprehensive income (loss), net of tax                                                               | 18             | 23             | 10 |  | (53) |
| Ending balance                                                                                                    | $ (69)         | $ (82)         | $ (69) |  | $ (82) |
|                                                                                                                   |
| [1]Derived from audited Consolidated Financial Statements.                                                        |

| X                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax, before reclassification adjustments of other comprehensive income (loss).
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| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
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