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Notes Payable - Authority to Borrow from U.S. Treasury (Details) $ in Billions | Dec. 31, 2017 USD ($)
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Debt Disclosure [Abstract] |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1.5

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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