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Segment Information - Geographic Concentration (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Concentration Risk |  |  |
Net sales | $ 6,583 | $ 5,809 | $ 5,379
Geographic concentration | South Africa |  |  |
Concentration Risk |  |  |
Net sales | 589 | 581 | 650
Geographic concentration | Colombia |  |  |
Concentration Risk |  |  |
Net sales | $ 757 | $ 495 | $ 421
Sales | Geographic concentration | South Africa |  |  |
Concentration Risk |  |  |
Concentration risk (as a percent) | 9.00% | 10.00% | 12.00%
Sales | Geographic concentration | Colombia |  |  |
Concentration Risk |  |  |
Concentration risk (as a percent) | 11.00% | 9.00% | 8.00%
Accounts Receivable | Geographic concentration | Foreign Country |  |  |
Concentration Risk |  |  |
Foreign receivables, excluding receivables due from affiliates | $ 327 | $ 242 |

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- Definition Amounts due from foreign customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. These exclude amounts due from affiliates. + References No definition available. + Details
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