| **Income Taxes (Details 4) - USD ($) $ in Millions**                | Dec. 31, 2018 | Dec. 31, 2017 |
|---------------------------------------------------------------------|---------------|---------------|
| **Deferred income tax assets:**                                     |          |          |
| Allowance for credit losses                                         | $ 111         | $ 96          |
| Tax carryforwards                                                   | 44            | 43            |
| Deferred tax assets, gross                                          | 155           | 139           |
| Deferred income tax liabilities (primarily lease basis differences) | (508)         | (441)         |
| Valuation allowance for deferred income tax assets                  | (2)           | (11)          |
| Deferred income tax on translation adjustment                       | (190)         | (165)         |
| Deferred income taxes, net                                          | $ (545)       | $ (478)       |

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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 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 allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.
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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 of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.
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