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Note 11. Income Taxes Details (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | $ 191 |  |
Effective Income Tax Rate Reconciliation, Percent | 0.00% | 0.00% |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 10.00% |  | 0.00%
Unrecognized Tax Benefits, Interest on Income Taxes Expense | $ 3 |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | 0.00% |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ 150 |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | 100 |  |
Other Tax Expense (Benefit) | 8 |  |
Current Income Tax Expense (Benefit) | $ 258 |  |
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Percent |  | 0.00% |
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount |  | $ 5 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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