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Commitments and Contingencies (Guarantee Arrangements) (Details) $ in Billions	Dec. 31, 2017 USD ($)
Financial agreements
Guarantee arrangements [Abstract]
Guarantee arrangements outstanding	$ 1.8

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- References

No definition available.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248

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