| **Restructuring and Impairments - Narrative (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 9 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 9 Months Ended |
|--------------------------------------------------------------------------------------------------------|----------------|----------------|----------------|----------------|----------------|----------------|
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| **Restructuring Cost and Reserve [Line Items]**                                                        |           |           |           |           |           |           |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Restructuring charges                                                                                  | $ 6            | $ 4            | $ 14           | $ 23           |           | $ 4            | $ 22 | $ 3 | $ 16 | $ 19 |   |   |   | $ 73 | $ 7 | $ 66 |   |   |   |
| Asset impairment charges                                                                               | 17             | 0              | 17             | 10             |           |           |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Asset Impairment Charges                                                                               | 24             |           |           |           | 13             |           |   |   |   |   |   | 4 |   |   |   |   |   |   |   |
| Restructuring and Related Cost, Expected Cost                                                          |           |           |           |           |           |           |   |   |   |   |   |   |   |   |   |   | 20 | 10 | 70 |
| Impairment of Intangible Assets (Excluding Goodwill)                                                   |           |           | $ 25           | $ 38           |           |           |   |   |   |   | $ 28 |   | $ 10 |   |   |   |   |   |   |

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| - Definition
The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.
+ References
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| - Definition
The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.
+ References
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| - Definition
The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.
+ References
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| - Definition
Amount expected to be charged against earnings in the current and future periods for the specified restructuring cost.
+ References
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| - Definition
Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.
+ References
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