| **Income Taxes - Narrative (Details) - USD ($) $ in Millions**                                      | 3 Months Ended | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Operating Loss Carryforwards [Line Items]**                                                       |           |            |   |   |   |   |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits             |           |            |   | $ 1,274 | $ 1,253 |   |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount               |           |            |   | 11 | 36 | $ 195 |
| Current Federal Tax Expense (Benefit)                                                               |           |            |   | (1) | (2) | 0 |
| Income (Loss) from Continuing Operations before Income Taxes, Domestic                              |           |            |   | (95) | (215) | (398) |
| Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |           |            |   | $ (132) | (41) | (234) |
| Income Taxes Percent Likelihood Of Being Realized Upon Settlement                                   |           |            |   | 50.00% |   |   |
| Income tax expense                                                                                  |           |            |   | $ (33) | (51) | (26) |
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense                                |           |            |   | 1 | (1) | 4 |
| Unrecognized Tax Benefits                                                                           |           |            |   | 50 | 41 |   |
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense                                |           |            |   | 8 | 8 |   |
| Income (Loss) from Continuing Operations before Income Taxes, Foreign                               |           |            |   | 63 | 112 | (158) |
| Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest               |           |            |   | (32) | (103) | (556) |
| Current State and Local Tax Expense (Benefit)                                                       |           |            |   | (4) | (1) | 7 |
| Current Foreign Tax Expense (Benefit)                                                               |           |            |   | (36) | (64) | (48) |
| Current Income Tax Expense (Benefit)                                                                |           |            |   | (41) | (67) | (41) |
| Deferred Federal Income Tax Expense (Benefit)                                                       |           |            |   | 13 | 2 | 13 |
| Deferred State and Local Income Tax Expense (Benefit)                                               |           |            |   | (1) | 0 | 0 |
| Deferred Foreign Income Tax Expense (Benefit)                                                       |           |            |   | (4) | 14 | 2 |
| Deferred Income Tax Expense (Benefit)                                                               |           |            |   | 8 | 16 | 15 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount                      |           |            |   | (3) | 0 | (4) |
| Effective Income Tax Rate Reconciliation, Tax Credit, Amount                                        |           |            |   | (3) | (4) | (5) |
| Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount              |           |            |   | 53 | (48) | (31) |
| Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount                  |           |            |   | 37 | 31 | 6 |
| Effective Income Tax Rate Reconciliation, Tax Contingency, Amount                                   |           |            |   | (10) | (1) | 15 |
| Effective Income Tax Rate Reconciliation, Tax Expense related to Equity Components                  |           |            |   | 0 | 0 | 13 |
| Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount             |           |            |   | 11 | 11 | 14 |
| Effective Income Tax Rate Reconciliation, Other Adjustments, Amount                                 |           |            |   | (3) | 19 | $ 17 |
| Deferred Tax Assets, Operating Loss Carryforwards                                                   |           |            |   | 1,324 | 1,161 |   |
| Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves                 |           |            |   | 362 | 419 |   |
| Deferred Tax Assets, in Process Research and Development                                            |           |            |   | 172 | 135 |   |
| Deferred Tax Assets, Tax Credit Carryforwards                                                       |           |            |   | 262 | 266 |   |
| Deferred Tax Assets, Other                                                                          |           |            |   | 232 | 239 |   |
| Deferred Tax Assets, Gross                                                                          |           |            |   | 3,626 | 3,473 |   |
| Deferred Tax Assets, Valuation Allowance                                                            |           |            |   | 3,434 | 3,260 |   |
| Deferred Tax Assets, Net of Valuation Allowance                                                     |           |            |   | 192 | 213 |   |
| Deferred Tax Liabilities, Undistributed Foreign Earnings                                            |           |            |   | 0 | (37) |   |
| Deferred Tax Liabilities, Other                                                                     |           |            |   | (31) | (26) |   |
| Deferred Tax Liabilities, Net                                                                       |           |            |   | (31) | (63) |   |
| Deferred Tax Assets, Operating Loss Carryforwards, Domestic                                         |           |            |   | 945 |   |   |
| Deferred Tax Assets, Operating Loss Carryforwards, State and Local                                  |           |            |   | 150 |   |   |
| Deferred Tax Assets, Operating Loss Carryforwards, Foreign                                          |           |            |   | 229 |   |   |
| Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount                                |           | $ (16)          | $ 29 | 132 | $ 41 |   |
| Undistributed Earnings of Foreign Subsidiaries                                                      |           |            |   | 551 |   |   |
| Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions                       |           |            |   | 9 |   |   |
| Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation                     |           |            |   | 0 |   |   |
| Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities              |           |            |   | 0 |   |   |
| Other Comprehensive Income (Loss) [Member]                                                          |           |            |   |   |   |   |
| **Operating Loss Carryforwards [Line Items]**                                                       |           |            |   |   |   |   |
| Income tax expense                                                                                  |           |            |   | $ 12 |   |   |
| Alternative Minimum Tax [Member]                                                                    |           |            |   |   |   |   |
| **Operating Loss Carryforwards [Line Items]**                                                       |           |            |   |   |   |   |
| Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | $ (13)         |            |   |   |   |   |
| Minimum [Member]                                                                                    |           |            |   |   |   |   |
| **Operating Loss Carryforwards [Line Items]**                                                       |           |            |   |   |   |   |
| Operating Loss Carryforwards, Duration of Carryforward                                              |           |            |   | 5 years |   |   |
| Maximum [Member]                                                                                    |           |            |   |   |   |   |
| **Operating Loss Carryforwards [Line Items]**                                                       |           |            |   |   |   |   |
| Operating Loss Carryforwards, Duration of Carryforward                                              |           |            |   | 20 years |   |   |
| Stock Option Tax Benefits [Member]                                                                  |           |            |   |   |   |   |
| **Operating Loss Carryforwards [Line Items]**                                                       |           |            |   |   |   |   |
| Deferred Tax Assets, Operating Loss Carryforwards                                                   |           |            |   | $ 63 |   |   |
| Convertible Subordinated Debt [Member]                                                              |           |            |   |   |   |   |
| **Operating Loss Carryforwards [Line Items]**                                                       |           |            |   |   |   |   |
| Income tax expense                                                                                  |           |            | $ 13 |   |   |   |

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.
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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.
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Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.
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Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from in-process research and development costs expensed in connection with a business combination.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.
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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.
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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.
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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from employee benefits, classified as other.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from warranty reserves.
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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.
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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.
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Amount of deferred tax liability attributable to taxable temporary differences classified as other.
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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.
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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.
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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.
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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).
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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.
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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.
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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.
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| - Definition
Amount of unrecognized tax benefits.
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| - Definition
Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.
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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.
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| - Definition
Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.
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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.
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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.
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