| **Restructuring and Impairments - Narrative (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 12 Months Ended | 24 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 18 Months Ended | 12 Months Ended | 18 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------|----------------|-----------------|-----------------|----------------|----------------|----------------|-----------------|-----------------|-----------------|----------------|-----------------|----------------|-----------------|
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| **Restructuring Cost and Reserve [Line Items]**                                                        |           |            |            |           |           |           |            |            |            |           |            |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Asset Impairment Charges                                                                               | $ 24           | $ 97            | $ 16            | $ 13           |           |           |            |            |            |           |            |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | $ 19 | $ 38 |
| Restructuring charges                                                                                  |           | 25              | 107             | 82             | 73             | 23             | 58              | 29              | 5               | 29             | 18              | 4              |            | 4 | 22 | 3 | 16 | 19 | 50 | 34 | 8 | 8 |   | 11 |   |   | 7 |   |   | 73 | 7 | 66 | 11 |   |   |   |   |   |
| Other post-employment benefit charges                                                                  |           |            |            |           |           |           |            |            |            |           |            |           |            |   |   |   |   |   |   |   |   |   |   |   | 2 | 2 |   |   |   |   |   |   |   |   |   |   |   |   |
| Restructuring and Related Cost, Cost Incurred to Date                                                  |           |            |            |           |           |           |            |            |            |           |            |           | 12              |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Restructuring and Related Cost, Expected Cost                                                          |           |            |            |           |           |           |            |            |            |           |            |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 20 | 70 |   |   |   |
| Pension curtailment gain                                                                               |           |            |            |           |           |           |            |            |            |           |            |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 8 |   |   |
| Impairment of Intangible Assets (Excluding Goodwill)                                                   |           | $ 105           | $ 44            | $ 75           |           |           |            |            |            |           |            |           |            |   |   |   |   |   |   |   |   |   | $ 51 |   |   |   |   | $ 28 | $ 10 |   |   |   |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.
+ 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
Period expense related to postemployment benefits.
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| - Definition
Amount of costs incurred to date for the specified type of restructuring cost.
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| - Definition
Amount expected to be recognized in earnings for the specified restructuring cost.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.
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