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Investments (Equity Investments) (Details Textual) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
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Debt Securities, Trading, and Equity Securities, FV-NI [Line Items] |  |
Equity securities | $ 155,000,000 |
Investment securities | $ 31,670,000,000 | $ 41,318,000,000
Equity securities [Member] |  |
Debt Securities, Trading, and Equity Securities, FV-NI [Line Items] |  |
Investment securities |  | $ 149,000,000

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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