| **Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended |        |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|--------|
||
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                                                                                  |            |   |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                                                                                                                       | $ 46            | $ 46   | $ 16 | $ 84 |
| Other Comprehensive Income (Loss), before Reclassifications, Net of Tax                                                                                                                         | 8               | 38     | (68) |   |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                                                                                                        | (8)             | (8)    | 0 |   |
| Other Comprehensive Income (Loss), Net of Tax                                                                                                                                                   | 0               | 30     | (68) |   |
| Accumulated Net Unrealized Investment Gain (Loss) [Member]                                                                                                                                      |            |   |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                                                                                  |            |   |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                                                                                                                       | 17              | 20     | 18 | 15 |
| Other Comprehensive Income (Loss), before Reclassifications, Net of Tax                                                                                                                         | 5               | 10     | 3 |   |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                                                                                                        | (8)             | (8)    | 0 |   |
| Other Comprehensive Income (Loss), Net of Tax                                                                                                                                                   | (3)             | 2      | 3 |   |
| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]                                                                                                             |            |   |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                                                                                  |            |   |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                                                                                                                       | 3               | 0      | 0 | 0 |
| Other Comprehensive Income (Loss), before Reclassifications, Net of Tax                                                                                                                         | 3               | 0      | 0 |   |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                                                                                                        | 0               | 0      | 0 |   |
| Other Comprehensive Income (Loss), Net of Tax                                                                                                                                                   | 3               | 0      | 0 |   |
| Accumulated Translation Adjustment [Member]                                                                                                                                                     |            |   |   |   |
| **Accumulated Other Comprehensive Income (Loss) [Line Items]**                                                                                                                                  |            |   |   |   |
| Accumulated Other Comprehensive Income (Loss), Net of Tax                                                                                                                                       | 26              | 26     | (2) | 69 |
| Other Comprehensive Income (Loss), before Reclassifications, Net of Tax                                                                                                                         | 0               | 28     | (71) |   |
| Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax                                                                                                        | 0               | 0      | 0 |   |
| Other Comprehensive Income (Loss), Net of Tax                                                                                                                                                   | $ 0             | $ 28   | $ (71) |   |

| X                                                                                                                                                                                    |
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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).
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
+ References
No definition available.
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