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Derivative Financial Instruments - Schedule of Gains (Losses) on Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	$ 5	$ (17)	$ 75	$ (5)
Forward purchases
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	4	0	33	0
Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	0	(17)	43	(5)
Futures
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives, net	$ 1	$ 0	$ (1)	$ 0

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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