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Income Taxes (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) assessment | Jun. 30, 2014 | Jun. 30, 2015 USD ($) assessment | Jun. 30, 2014
Income Taxes [Line Items] |  |  |  |
Effective income tax rate | 27.20% | 27.60% | 28.00% | 27.30%
Brazilian Federal Revenue Service [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Number of separate tax assessments | assessment | 3 |  | 3 |
Estimated Tax Assessment Including Penalties and Interest | $ 436 |  | $ 436 |
Estimated Additional Tax Assessment | 50 |  | 50 |
Argentine Tax Authorities [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Estimated Additional Tax Assessment | 284 |  | 284 |
Estimated Tax Assessment Including Interest | $ 92 |  | $ 92 |

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