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Derivative Financial Instruments, Investments and Fair Value Measurements - Schedule of Gains on Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on derivatives, net | $ 5 | $ 18 | $ 70 | $ 38
Forward purchases and sales contracts, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on derivatives, net | 4 | 17 | 55 | 37
Commodity swap instruments |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on derivatives, net | 1 | 0 | 5 | 0
Futures contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on derivatives, net | $ 0 | $ 1 | $ 10 | $ 1

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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