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Note 8. Short And Long-Term Debt Other Debt Facilities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Oct. 23, 2015
Line of Credit Facility [Line Items]      
Letter of Credit, borrowing capacity   $ 125 $ 125
Unsecured Letter of Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Letter of Credit, borrowing capacity $ 131    
Outstanding letter of credit 127    
Unsecured Letter of Credit Facility [Member] | September 2018      
Line of Credit Facility [Line Items]      
Letter of Credit, borrowing capacity 65    
Unsecured Letter of Credit Facility [Member] | December 2019      
Line of Credit Facility [Line Items]      
Letter of Credit, borrowing capacity $ 66