| **Common Stock Restricted Stock - Market Based Awards Fair Value Assumptions (Details) - USD ($) $ / shares in Units, $ in Millions** | 12 Months Ended |         |         |
|---------------------------------------------------------------------------------------------------------------------------------------|-----------------|---------|---------|
||
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |            |    |    |   |   |
| Stock Repurchase Program, Authorized Amount                                                                                           |            |    |    | $ 525 | $ 200 |
| Minimum [Member]                                                                                                                      |            |    |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |            |    |    |   |   |
| Performance Shares Payout Range                                                                                                       | 0.00%           |    |    |   |   |
| Maximum [Member]                                                                                                                      |            |    |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |            |    |    |   |   |
| Performance Shares Payout Range                                                                                                       | 250.00%         |    |    |   |   |
| Restricted Stock - Market Based Awards [Member]                                                                                       |            |    |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |            |    |    |   |   |
| Expected term of award                                                                                                                | 3 years         | 3 years | 3 years |   |   |
| Risk-free interest rate                                                                                                               | 0.20%           | 1.40%   | 2.50%   |   |   |
| Expected Volatility                                                                                                                   | 84.60%          | 46.60%  | 41.40%  |   |   |
| Weighted-average grant date fair value per share                                                                                      | $ 54.01         | $ 33.52 | $ 56.68 |   |   |
| Restricted Stock [Member]                                                                                                             |            |    |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |            |    |    |   |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award                                                     | three-year      |    |    |   |   |
| Weighted-average grant date fair value per share                                                                                      | $ 33.64         | $ 11.98 | $ 40.34 |   |   |
| SRC [Member] | Restricted Stock - Market Based Awards [Member]                                                                        |            |    |    |   |   |
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                                                    |            |    |    |   |   |
| Market based performance shares granted to executives                                                                                 | 155,928         |    |    |   |   |

| X                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Market based performance shares granted to executives
+ References
No definition available.
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| X                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Performance Shares Payout Range
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of terms of award under share-based payment arrangement.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.
+ References
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| X                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stock repurchase plan authorized.
+ References
No definition available.
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| X                                                                                                                       |
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| X                                                                                                                       |
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| X                                                                                                                                                         |
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| X                                                                                                                                           |
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| X                                                                                                                                      |
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