| **Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions** | Total    | Common Stock | Additional Paid in Capital | Accumulated Other Comprehensive Loss | Treasury Stock at Cost | (Accumulated Deficit) Retained Earnings | Non-controlling Interests |
|-----------------------------------------------------------------------------|----------|--------------|----------------------------|--------------------------------------|------------------------|-----------------------------------------|---------------------------|
| Balance at Beginning of Period at Dec. 31, 2018                             | $ 10,484 | $ 5          | $ 8,203                    | $ (32)                               | $ (730)                | $ 1,980                                 | $ 1,058                   |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**              |     |         |                       |                                 |                   |                                    |                      |
| Net Loss                                                                    | (289)    |         |                       |                                 |                   | (313)                                   | 24                        |
| Stock-based Compensation                                                    | 14       |         | 14                         |                                 |                   |                                    |                      |
| Dividends                                                                   | (53)     |         |                       |                                 |                   | (53)                                    |                      |
| Distributions to Noncontrolling Interest Owners                             | (17)     |         | 0                          | 0                                    |                   |                                    | (17)                      |
| Contributions from Noncontrolling Interest Owners                           | 10       |         |                       |                                 |                   |                                    | 10                        |
| Other                                                                       | (6)      |         | 2                          |                                 | (5)                    |                                    | (3)                       |
| Balance at End of Period at Mar. 31, 2019                                   | 10,143   | 5            | 8,219                      | (32)                                 | (735)                  | 1,614                                   | 1,072                     |
| Balance at Beginning of Period at Dec. 31, 2019                             | 9,055    | 5            | 8,927                      | (31)                                 | (732)                  | 241                                     | 645                       |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**              |     |         |                       |                                 |                   |                                    |                      |
| Net Loss                                                                    | (4,007)  |         |                       |                                 |                   | (3,963)                                 | (44)                      |
| Stock-based Compensation                                                    | 17       |         | 17                         |                                 |                   |                                    |                      |
| Dividends                                                                   | (58)     |         |                       |                                 |                   | (58)                                    |                      |
| Distributions to Noncontrolling Interest Owners                             | (29)     |         |                       |                                 |                   |                                    | (29)                      |
| Contributions from Noncontrolling Interest Owners                           | 78       |         |                       |                                 |                   |                                    | 78                        |
| Other                                                                       | (10)     |         | (2)                        | (1)                                  | (8)                    |                                    | (1)                       |
| Balance at End of Period at Mar. 31, 2020                                   | $ 5,046  | $ 5          | $ 8,942                    | $ (30)                               | $ (740)                | $ (3,780)                               | $ 649                     |

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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Noncontrolling Interest, Increase From Contribution
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| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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| - Definition
Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).
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| - Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.
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| - Definition
This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
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