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Derivative Financial Instruments, Investments and Fair Value Measurements - Schedule of Gains (Losses) on Derivatives (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Total gain on derivatives, net	$ 46	$ 16
Forward purchases and sales, net
Derivative Instruments, Gain (Loss) [Line Items]
Total gain on derivatives, net	36	17
Futures
Derivative Instruments, Gain (Loss) [Line Items]
Total gain on derivatives, net	$ 10	$ (1)

X

- 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=109980867&loc=SL5618551-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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