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Note 10. Income Taxes Accounting for Uncertainty in Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized Tax Benefits | $ (22) | $ (78) | $ (78) | $ (20)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  |  |  | 17
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit |  |  |  | $ 1
Unrecognized Tax Benefits, Statute of Limitations, Scheduled Expiration as of Reporting Date | 12 months |  |  |
Increase (Decrease) in Interest Accrued for Unrecognized Tax Benefits | $ 1 | 2 | 4 |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns |  |  |  |
Unrecognized Tax Benefits, Beginning of Period | 22 | 78 | 78 |
Gross increases—tax positions in prior periods |  | 1 | 3 |
Reduction due to lapse of statute of limitations | (2) | (3) | (3) |
Gross decreases—tax positions in prior periods |  | (54) |  |
Unrecognized Tax Benefits, End of Period | $ 20 | $ 22 | $ 78 |

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- Definition Increase (Decrease) in the amount of interest expense accrued for an underpayment of income taxes. + References No definition available. + Details
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- Definition The period of time for which the statute of limitations is set to expire in certain tax jurisdictions for unrecognized tax benefits. + References No definition available. + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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