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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 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 + Details
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- Definition 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 + Details
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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. + References No definition available. + Details
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