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Note 8. Short And Long-Term Debt Unsecured Notes (Details) - Senior Notes - USD ($) $ in Millions | Feb. 15, 2019 | Dec. 31, 2018
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4.50% Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest Rate |  | 4.50%
5.25% Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest Rate |  | 5.25%
4.875% Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest Rate |  | 4.875%
Subsequent Event | 4.50% Senior Notes |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Repurchased Face Amount | $ 450 |

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