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Derivative Instruments - Derivatives and Hedges (Details) € in Millions, $ in Millions | Mar. 31, 2019 USD ($) | Mar. 31, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€)
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Commodity forwards contracts | Derivatives designated as hedging instruments |  |  |  |  |  |
Derivatives and Hedges |  |  |  |  |  |
Notional amount | $ 20 |  | $ 21 | $ 31 |  |
Commodity forwards contracts | Cash Flow Hedges |  |  |  |  |  |
Derivatives and Hedges |  |  |  |  |  |
Unrecognized (loss) gain included in Accumulated OCI | 3 |  | 1 | 4 |  |
Foreign exchange contracts | Derivatives not designated as hedging instruments |  |  |  |  |  |
Derivatives and Hedges |  |  |  |  |  |
Notional amount | 625 |  | 470 | 350 |  |
Cross-currency swap | Euro-functional subsidiaries |  |  |  |  |  |
Derivatives and Hedges |  |  |  |  |  |
Notional amount | 210 | € 184 |  |  | $ 310 | € 263
Cross-currency swap | AUD functional subsidiary |  |  |  |  |  |
Derivatives and Hedges |  |  |  |  |  |
Notional amount | 168 |  |  |  |  |
Cross-currency swap | NZD functional subsidiary |  |  |  |  |  |
Derivatives and Hedges |  |  |  |  |  |
Notional amount | 109 |  |  |  |  |
Cross-currency swap | Cash Flow Hedges |  |  |  |  |  |
Derivatives and Hedges |  |  |  |  |  |
Unrecognized (loss) gain included in Accumulated OCI | (11) |  | (9) | $ (6) |  |
Interest Rate Risk | Cash Flow Hedges | Maximum |  |  |  |  |  |
Derivatives and Hedges |  |  |  |  |  |
Unrecognized (loss) gain included in Accumulated OCI | $ (1) |  | $ (1) |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References No definition available. + Details
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