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Financial Instruments - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	$ 10,500	$ 10,200
Derivative, notional amount, net	2,800	$ 3,300
Derivative, transfer to earnings	$ 2
Cash flow hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, term	2 years	3 years
Related party amount, due to related party | GE
Derivative Instruments, Gain (Loss) [Line Items]
Investment securities	$ 156	$ 127
Non-U.S. debt securities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, term	3 years

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- Definition

Derivative, Notional Amount, Net

+ References

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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

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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