| **Significant Accounting Policies and Recent Accounting Standards - Restructuring Charges (Details) - USD ($) $ in Millions** | 12 Months Ended |        |
|-------------------------------------------------------------------------------------------------------------------------------|-----------------|--------|
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| **Business Combination, Separately Recognized Transactions [Line Items]**                                                     |            |   |
| Restructuring charges                                                                                                         | $ 143           |   |
| Current liabilities of discontinued operations                                                                                | 91              | $ 67   |
| Discontinued Operations                                                                                                       |            |   |
| **Business Combination, Separately Recognized Transactions [Line Items]**                                                     |            |   |
| Current liabilities of discontinued operations                                                                                | $ 53            | $ 44   |

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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| - Definition
Amount classified as liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.
+ References
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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.
+ References
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| X                                                                                                                                                                                                  |
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