| **Income Taxes - Textual Information (Details) $ in Millions**                                         |         | 3 Months Ended | 12 Months Ended |         |
|--------------------------------------------------------------------------------------------------------|---------|----------------|-----------------|---------|
||
| **Total Gross Unrecognized Tax Benefits**                                                              |    |           |            |    |   |   |   |   |   |
| Decrease in tax carryforward                                                                           |    |           |            |    |   | $ 244 |   |   |   |
| Merger termination fee                                                                                 | $ 3,500 | $ 0            | $ 0             | $ 3,500 | $ 0 | 3,500 | $ 0 | $ 0 |   |
| Operating loss carryforwards                                                                           |    | 1,110          |            |    |   | 1,110 |   |   |   |
| Valuation allowances                                                                                   |    | 2,010          |            |    |   | 2,010 | 1,210 |   |   |
| Deferred tax assets, operating loss carryforwards, foreign                                             |    | 76             |            |    |   | 76 |   |   |   |
| Deferred tax liability not provided for temporary difference                                           |    | 4,500          |            |    |   | 4,500 |   |   |   |
| Tax liabilities for gross unrecognized tax benefits                                                    |    | 351            |            |    |   | 351 | $ 312 | $ 291 | $ 282 |
| Interest accrued on income taxes for unrecognized tax benefits                                         |    | 48             |            |    |   | 48 |   |   |   |
| Penalties accrued on income taxes for unrecognized tax benefits                                        |    | 26             |            |    |   | 26 |   |   |   |
| Unrecognized tax benefits that would impact effective tax rate                                         |    | 341            |            |    |   | 341 |   |   |   |
| Deferred tax asset that we did not prevail on all uncertain tax position                               |    | 10             |            |    |   | 10 |   |   |   |
| Uncertain tax positions tax liabilities net of assets                                                  |    | 214            |            |    |   | 214 |   |   |   |
| Insignificant change in unrecognized tax benefits is reasonably possible, amount related to tax assets |    | 2              |            |    |   | 2 |   |   |   |
| Unrecognized tax benefits included in noncurrent portion of income tax liabilities                     |    | $ 135          |            |    |   | $ 135 |   |   |   |
| Number of countries in which entity operates (more than) | country                                     |    | 80             |            |    |   | 80 |   |   |   |
| Indefinite Foreign Tax                                                                                 |    |           |            |    |   |   |   |   |   |
| **Total Gross Unrecognized Tax Benefits**                                                              |    |           |            |    |   |   |   |   |   |
| Deferred tax assets, tax credit carryforwards, foreign                                                 |    | $ 127          |            |    |   | $ 127 |   |   |   |
| Definite Foreign Tax                                                                                   |    |           |            |    |   |   |   |   |   |
| **Total Gross Unrecognized Tax Benefits**                                                              |    |           |            |    |   |   |   |   |   |
| Deferred tax assets, tax credit carryforwards, foreign                                                 |    | 59             |            |    |   | 59 |   |   |   |
| Other Tax                                                                                              |    |           |            |    |   |   |   |   |   |
| **Total Gross Unrecognized Tax Benefits**                                                              |    |           |            |    |   |   |   |   |   |
| Deferred tax assets, tax credit carryforwards                                                          |    | 28             |            |    |   | 28 |   |   |   |
| Five year carryforward                                                                                 |    |           |            |    |   |   |   |   |   |
| **Total Gross Unrecognized Tax Benefits**                                                              |    |           |            |    |   |   |   |   |   |
| Operating loss carryforwards                                                                           |    | 435            |            |    |   | $ 435 |   |   |   |
| Expiration of operation loss carryforwards over the next 5 years                                       |    |           |            |    |   | 5 years |   |   |   |
| Twenty year carryforward                                                                               |    |           |            |    |   |   |   |   |   |
| **Total Gross Unrecognized Tax Benefits**                                                              |    |           |            |    |   |   |   |   |   |
| Operating loss carryforwards                                                                           |    | 142            |            |    |   | $ 142 |   |   |   |
| Expiration of operation loss carryforwards over the next 20 years                                      |    |           |            |    |   | 20 years |   |   |   |
| Foreign Net Operating Loss                                                                             |    |           |            |    |   |   |   |   |   |
| **Total Gross Unrecognized Tax Benefits**                                                              |    |           |            |    |   |   |   |   |   |
| Valuation allowances                                                                                   |    | 1,010          |            |    |   | $ 1,010 |   |   |   |
| US And Foreign Tax Credit Carryforward                                                                 |    |           |            |    |   |   |   |   |   |
| **Total Gross Unrecognized Tax Benefits**                                                              |    |           |            |    |   |   |   |   |   |
| Valuation allowances                                                                                   |    | 186            |            |    |   | 186 |   |   |   |
| Other United States Net Operating Loss Tax Credit Carryforward                                         |    |           |            |    |   |   |   |   |   |
| **Total Gross Unrecognized Tax Benefits**                                                              |    |           |            |    |   |   |   |   |   |
| Valuation allowances                                                                                   |    | 55             |            |    |   | 55 |   |   |   |
| Other US And Foreign Deferred Tax Assets                                                               |    |           |            |    |   |   |   |   |   |
| **Total Gross Unrecognized Tax Benefits**                                                              |    |           |            |    |   |   |   |   |   |
| Valuation allowances                                                                                   |    | $ 761          |            |    |   | $ 761 |   |   |   |

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Insignificant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount related to tax assets
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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 foreign tax credit carryforwards.
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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible tax credit carryforwards, classified as other.
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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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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 recognized for uncertainty in income taxes classified as noncurrent.
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The number of countries in which the entity operates as of balance sheet date.
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.
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| - Definition
The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.
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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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Amount of unrecognized tax benefits.
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Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return.
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Amount of interest expense accrued for an underpayment of income taxes.
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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.
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