| **Income Taxes (Details 4) (USD $)In Millions, unless otherwise specified** | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 |
|-----------------------------------------------------------------------------|---------------|---------------|---------------|
| **Deferred tax assets:**                                                    |          |          |          |
| Allowance for credit losses                                                 | $ 156         | $ 114         | $ 91          |
| Tax credit carryforwards                                                    | 0             | 13            | 24            |
| Net operating loss carryforwards                                            | 59            | 69            | 92            |
| Deferred tax assets, gross                                                  | 215           | 196           | 207           |
| **Deferred tax liabilities**                                                |          |          |          |
| Deferred income tax liabilities (primarily lease basis differences)         | (468)         | (494)         | (539)         |
| Valuation allowance for deferred income tax assets                          | (9)           | (9)           | (8)           |
| Deferred income tax on translation adjustment                               | (173)         | (193)         | (169)         |
| Deferred income taxes, net                                                  | $ (435)       | $ (500)       | $ (509)       |

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.
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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.
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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 undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.
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