| **Income Taxes - Components of Income Tax Benefit (Expense) (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended                                                 | 12 Months Ended                                              |
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| **Income Tax Disclosure [Abstract]**                                                                                   |                                                           |                                                         |   |   |   |
| Current Federal Tax Expense (Benefit)                                                                                  |                                                           |                                                         | $ 0us-gaap_CurrentFederalTaxExpenseBenefit | $ 4us-gaap_CurrentFederalTaxExpenseBenefit | $ (2)us-gaap_CurrentFederalTaxExpenseBenefit |
| Current State and Local Tax Expense (Benefit)                                                                          |                                                           |                                                         | 7us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (10)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (11)us-gaap_CurrentStateAndLocalTaxExpenseBenefit |
| Current Foreign Tax Expense (Benefit)                                                                                  |                                                           |                                                         | (48)us-gaap_CurrentForeignTaxExpenseBenefit | (58)us-gaap_CurrentForeignTaxExpenseBenefit | 4us-gaap_CurrentForeignTaxExpenseBenefit |
| Current Income Tax Expense (Benefit)                                                                                   |                                                           |                                                         | (41)us-gaap_CurrentIncomeTaxExpenseBenefit | (64)us-gaap_CurrentIncomeTaxExpenseBenefit | (9)us-gaap_CurrentIncomeTaxExpenseBenefit |
| Deferred Federal Income Tax Expense (Benefit)                                                                          |                                                           |                                                         | 13us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 219us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (1,841)us-gaap_DeferredFederalIncomeTaxExpenseBenefit |
| Deferred State and Local Income Tax Expense (Benefit)                                                                  |                                                           |                                                         | 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 2us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (137)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit |
| Deferred Foreign Income Tax Expense (Benefit)                                                                          |                                                           |                                                         | 2us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 14us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 207us-gaap_DeferredForeignIncomeTaxExpenseBenefit |
| Deferred Income Tax Expense (Benefit)                                                                                  |                                                           |                                                         | 15us-gaap_DeferredIncomeTaxExpenseBenefit | 235us-gaap_DeferredIncomeTaxExpenseBenefit | (1,771)us-gaap_DeferredIncomeTaxExpenseBenefit |
| Income Tax Expense (Benefit)                                                                                           |                                                           |                                                         | (26)us-gaap_IncomeTaxExpenseBenefit | 171us-gaap_IncomeTaxExpenseBenefit | (1,780)us-gaap_IncomeTaxExpenseBenefit |
| Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount                                                   | $ (16)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 29us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 234us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 350us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 2,200us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |

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| - Definition
Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.
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Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.
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| - Definition
Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.
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