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Note 16. Income Taxes Examination Year (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Operating Loss Carryforwards [Line Items] |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount |  | $ 136 | $ 336
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount |  | 0 | 15
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount | $ (67) | (92) | (13)
Effective Income Tax Rate Reconciliation, Deduction, Amount | 21 |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Amount |  | 7 | 6
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  | 75
Unrecognized Tax Benefits, Period Increase (Decrease) |  | 471 |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  | 14 | (13)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount |  | 7 | (5)
Income Tax Expense (Benefit) | 99 | $ 1,839 | $ 418
IRELAND |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 133 |  |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | (10) |  |
Effective Income Tax Rate Reconciliation, Deduction, Amount | 28 |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Amount | 13 |  |
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount | (19) |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | 30 |  |
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount | 11 |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | 10 |  |
Unrecognized Tax Benefits, Period Increase (Decrease) | 50 |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | 21 |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 3 |  |
Income Tax Expense (Benefit) | $ 99 |  |
Secretariat of the Federal Revenue Bureau of Brazil [Member] | Tax Year 2012 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2012 |  |
State Administration of Taxation, China [Member] | Tax Year 2011 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2011 |  |
MTS CZECH REPUBLIC [Member] | Tax Year 2008 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2008 |  |
Ministry of the Economy, Finance and Industry, France [Member] | Tax Year 2013 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2013 |  |
Federal Ministry of Finance, Germany [Member] | Tax Year 2013 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2013 |  |
Inland Revenue, Hong Kong [Member] | Tax Year 2011 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2011 |  |
National Tax Agency, Japan [Member] | Tax Year 2012 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2012 |  |
Luxembourg Inland Revenue [Member] | Tax Year 2008 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2012 |  |
Mexican Tax Authority [Member] | Tax Year 2012 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2012 |  |
KDPW_CCP [Member] | Tax Year 2008 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2008 |  |
HSBC-X UNITED KINGDOM [Member] | Tax Year 2011 [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2011 |  |
State and Local Jurisdiction [Member] | Latest Tax Year [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2017 |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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