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Note 8. Short And Long-Term Debt Unsecured Notes (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2016
Dec. 31, 2016
May 26, 2016
Mar. 01, 2016
Dec. 31, 2015
Debt Instrument [Line Items]          
Long-term Debt, Gross [1]   $ 3,763      
Line of Credit [Member] | Revolving Credit Facility          
Debt Instrument [Line Items]          
Proceeds from Issuance of Debt $ 400        
Senior Notes [Member] | 3.375% Senior Notes          
Debt Instrument [Line Items]          
Interest Rate   3.375%      
Long-term Debt, Gross   $ 0     $ 500
Repayments of Subordinated Debt $ 500        
Senior Notes [Member] | 4.50% Senior Notes          
Debt Instrument [Line Items]          
Interest Rate   4.50%      
Long-term Debt, Gross   $ 450     450
Senior Notes [Member] | 5.25% Senior Notes          
Debt Instrument [Line Items]          
Interest Rate   5.25%      
Long-term Debt, Gross   $ 550   $ 300 300
Senior Notes [Member] | Additional 5.25% Senior Notes          
Debt Instrument [Line Items]          
Long-term Debt, Gross       $ 250  
Senior Notes [Member] | 4.875% Senior Notes          
Debt Instrument [Line Items]          
Interest Rate   4.875%      
Long-term Debt, Gross   $ 500     $ 0
Debt Instrument, Face Amount     $ 500    
[1] Not included in this table, the Company had $127 million of outstanding letters of credit at December 31, 2016 under the Unsecured Letter of Credit Facility with a weighted average rate of 2.93%. At December 31, 2016 the capacity of the facility was $131 million.