| **Restructuring and Impairments - Narrative (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended | 3 Months Ended |
|--------------------------------------------------------------------------------------------------------|-----------------|----------------|-----------------|-----------------|----------------|
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| **Restructuring Cost and Reserve [Line Items]**                                                        |            |           |            |            |           |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Restructuring charges                                                                                  | $ 108           | $ 92           | $ (15)          | $ 29            | $ 58           | $ 23 | $ 73 | $ (15) | $ 9 | $ 4 | $ 5 | $ 5 | $ 29 |   | $ 18 | $ 4 |   | $ 3 | $ 16 | $ 19 | $ 73 | $ 7 | $ 66 |
| Restructuring and Related Cost, Cost Incurred to Date                                                  |            |           |            |            |           |   |   |   |   |   |   |   |   | $ 34 |   |   | $ 12 |   |   |   |   |   |   |

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| - Definition
Amount of costs incurred to date for the specified type of 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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| X                                                                                                                                                                        |
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