| **Goodwill (Details)In Millions, unless otherwise specified**         | 3 Months Ended | 12 Months Ended |        | 12 Months Ended |        |        | 3 Months Ended | 12 Months Ended |        |        |        | 12 Months Ended |        |
|-----------------------------------------------------------------------|----------------|-----------------|--------|-----------------|--------|--------|----------------|-----------------|--------|--------|--------|-----------------|--------|
||
| **Goodwill [Line Items]**                                             |           |            |   |            |   |   |           |            |   |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Goodwill impairment charge                                            |           | $ 81            | $ 0    |            | $ 0    |   | $ 0            |            |   |   | $ (77) | $ (4)           | $ 81   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Royalty Expense                                                       |           |            |   | 30              |   |   |           |            |   |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Payments for Royalties                                                |           |            | 12     | 9               |   |   |           |            |   |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Impairment of finitie lived intangible assets                         |           |            | 41     |            | 51     |   |           | 10              |   |   |   |            |   |   |   |   | 23 | 26 | 18 | 25 |   | 28 |   |   |   |   |   |
| Intangible assets amortization expense                                |           | 22              | 25     |            | 29     |   |           |            |   |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Asset Impairment Charges                                              | 24             | 97              | 16     |            | 13     |   |           |            |   |   |   |            |   |   |   |   |   |   |   |   | 4 | 28 | 51 | 105 | 44 | 64 |   |
| Goodwill                                                              |           | $ 184           | $ 280  |            | $ 319  | $ 324  | $ 38           | $ 38            | $ 38   | $ 38   | $ 0    |            | $ 0    | $ 82 | $ 82 | $ 82 |   |   |   |   |   |   |   |   |   |   | $ 146 |
| Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |           | 0.00%           |   |            |   |   |           |            |   |   |   |            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |

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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ 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 a finite-lived intangible asset to fair value.
+ References
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| - Definition
The amount of cash paid for royalties during the current period.
+ References
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| - Definition
Percentage of fair value of reporting unit in excess of carrying amount.
+ References
No definition available.
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| - Definition
Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.
+ References
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