| **Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions** | 12 Months Ended |
|------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**                                                                                     |            |   |   |
| Accumulated other comprehensive income (loss), beginning balance                                                                                     | $ (67)          | $ 15 | $ (50) |
| Other comprehensive income (loss) before reclassifications                                                                                           | 43              | 84 | 63 |
| Amounts reclassified from accumulated other comprehensive income (loss)                                                                              | (48)            | (166) | 2 |
| Total other comprehensive income (loss), net of tax                                                                                                  | (5)             | (82) | 65 |
| Accumulated other comprehensive income (loss), ending balance                                                                                        | (72)            | (67) | 15 |
| Unrealized Net Gains (Losses) on Available-for-Sale Securities                                                                                       |            |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**                                                                                     |            |   |   |
| Accumulated other comprehensive income (loss), beginning balance                                                                                     | (1)             | (3) | 0 |
| Other comprehensive income (loss) before reclassifications                                                                                           | 1               | 1 | (3) |
| Amounts reclassified from accumulated other comprehensive income (loss)                                                                              | 0               | 1 | 0 |
| Total other comprehensive income (loss), net of tax                                                                                                  | 1               | 2 | (3) |
| Accumulated other comprehensive income (loss), ending balance                                                                                        | 0               | (1) | (3) |
| Unrealized Net Gains (Losses) on Derivative Instruments                                                                                              |            |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**                                                                                     |            |   |   |
| Accumulated other comprehensive income (loss), beginning balance                                                                                     | 13              | 47 | (29) |
| Other comprehensive income (loss) before reclassifications                                                                                           | 45              | 133 | 74 |
| Amounts reclassified from accumulated other comprehensive income (loss)                                                                              | (48)            | (167) | 2 |
| Total other comprehensive income (loss), net of tax                                                                                                  | (3)             | (34) | 76 |
| Accumulated other comprehensive income (loss), ending balance                                                                                        | 10              | 13 | 47 |
| Foreign Currency Translation Adjustments                                                                                                             |            |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Roll Forward]**                                                                                     |            |   |   |
| Accumulated other comprehensive income (loss), beginning balance                                                                                     | (79)            | (29) | (21) |
| Other comprehensive income (loss) before reclassifications                                                                                           | (3)             | (50) | (8) |
| Amounts reclassified from accumulated other comprehensive income (loss)                                                                              | 0               |   | 0 |
| Total other comprehensive income (loss), net of tax                                                                                                  | (3)             | (50) | (8) |
| Accumulated other comprehensive income (loss), ending balance                                                                                        | $ (82)          | $ (79) | $ (29) |

| 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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