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Note 9 - Income Taxes Summary of Income Tax Examinations (Details) - Internal Revenue Service (IRS) [Member] - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 04, 2014 | May 31, 2010 | Jun. 30, 2008
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Income Tax Examination [Line Items] |  |  |  |
Income Tax Examination, Amount of Claimed Income Tax Refund Being Disallowed for Tax Years 2006 and 2007 |  | $ 105 |  |
REMIC Residual [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Qualified Deposit With The U.S. Department Of Treasury Relating to Tax Years 2000 Through 2004 |  |  |  | $ 85
Qualified Deposit With The U.S. Department Of Treasury Relating To Tax Years 2005 Through 2007 |  |  | $ 4 |
Income Tax Examination, Penalties Accrued |  | $ 157 |  |
Income Tax Examination, Notice of Deficiency, Amounts Related to Unpaid Taxes and Penalties | $ 146 |  |  |
Income Tax Examination, Proposed State Liabilities Resulting from IRS Examination of Tax Years 2000 Through 2007 | $ 36 |  |  |

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- Definition The amount of estimated state tax liabilities as of the balance sheet date arising from IRS examinations for tax years 2000 through 2007. + References No definition available. + Details
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- Definition The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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