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Note 8. Short And Long-Term Debt Senior Secured Credit Facility (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 31, 2016
Jul. 20, 2016
Dec. 31, 2015
Oct. 23, 2015
Mar. 05, 2013
Debt Instrument [Line Items]            
Long-term Debt, Gross [1]   $ 3,763        
Letter of Credit, borrowing capacity       $ 125 $ 125  
Additional Credit Facilities           $ 500
Scenario, Actual [Member]            
Debt Instrument [Line Items]            
Senior secured leverage ratio   2.16        
Ratio of Indebtedness to Net Capital Denominator   1.00        
Maximum [Member] | Required Covenant Ratio to Receive Additional Credit Facilities [Member]            
Debt Instrument [Line Items]            
Senior secured leverage ratio   3.50        
Ratio of Indebtedness to Net Capital Denominator   1.00        
Maximum [Member] | Required Covenant Ratio [Member]            
Debt Instrument [Line Items]            
Senior secured leverage ratio   4.75        
Ratio of Indebtedness to Net Capital Denominator   1.00        
LIBOR [Member]            
Debt Instrument [Line Items]            
Description of variable interest rate basis   LIBOR        
ABR [Member]            
Debt Instrument [Line Items]            
Description of variable interest rate basis   ABR        
Revolving Credit Facility under Term Loan A Facility            
Debt Instrument [Line Items]            
Debt Maturity   5 years        
Term Loan B | LIBOR [Member]            
Debt Instrument [Line Items]            
Debt Instrument, basis spread on variable rate   3.00%        
Debt Instrument, basis spread on variable rate, floor   0.75%        
Term Loan B | ABR [Member]            
Debt Instrument [Line Items]            
Debt Instrument, basis spread on variable rate   2.00%        
Debt Instrument, basis spread on variable rate, floor   1.75%        
Line of Credit [Member] | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility borrowing capacity   $ 815     $ 815  
Line of Credit [Member] | Revolving Credit Facility | Greater than 3.50 to 1.00 | LIBOR [Member]            
Debt Instrument [Line Items]            
Debt Instrument, basis spread on variable rate   2.50%        
Line of Credit [Member] | Revolving Credit Facility | Greater than 3.50 to 1.00 | ABR [Member]            
Debt Instrument [Line Items]            
Debt Instrument, basis spread on variable rate   1.50%        
Line of Credit [Member] | Revolving Credit Facility | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 | LIBOR [Member]            
Debt Instrument [Line Items]            
Debt Instrument, basis spread on variable rate   2.25%        
Line of Credit [Member] | Revolving Credit Facility | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00 | ABR [Member]            
Debt Instrument [Line Items]            
Debt Instrument, basis spread on variable rate   1.25%        
Line of Credit [Member] | Revolving Credit Facility | Less than 2.50 to 1.00 | LIBOR [Member]            
Debt Instrument [Line Items]            
Debt Instrument, basis spread on variable rate   2.00%        
Line of Credit [Member] | Revolving Credit Facility | Less than 2.50 to 1.00 | ABR [Member]            
Debt Instrument [Line Items]            
Debt Instrument, basis spread on variable rate   1.00%        
Secured Debt [Member] | Term Loan B            
Debt Instrument [Line Items]            
Debt Instrument, Repurchase Amount     $ 1,858      
Long-term Debt, Gross   $ 1,094 [2] $ 1,100 $ 1,867    
Annual percentage of original principal amount for quarterly amortization payments   1.00%        
Subsequent Event | Term Loan B | LIBOR [Member]            
Debt Instrument [Line Items]            
Debt Instrument, basis spread on variable rate 2.25%          
Debt Instrument, basis spread on variable rate, floor 0.75%          
Subsequent Event | Line of Credit [Member] | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility borrowing capacity $ 1,050          
[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.
[2] The Term Loan B provides for quarterly amortization payments totaling 1% per annum of the original principal amount. The interest rate with respect to term loans under the Term Loan B is based on, at the Company’s option, (a) adjusted LIBOR plus 3.00% (with a LIBOR floor of 0.75%) or (b) JPMorgan Chase Bank, N.A.’s prime rate ("ABR") plus 2.00% (with an ABR floor of 1.75%). See Note 20, "Subsequent Events" for a description of the January 2017 refinancing of the Term Loan B.