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Derivative and Other Financial Instruments (Impact on OCI from Changes in Derivative Fair Value) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Gain (loss), recognized in OCI	$ 47	$ (153)
Foreign exchange
Derivative [Line Items]
Gain (loss), recognized in OCI	$ 11	$ 0

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- Definition

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+ References

No definition available.

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- Definition

Amount, before tax and reclassification, of gain (loss) from derivative designated and qualifying as net investment hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CCC
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998896-113959

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