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Note 8. Short And Long-Term Debt Unsecured Notes (Details) - Senior Notes
Dec. 31, 2017
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%