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Note 8. Short And Long-Term Debt Term Loan A Facility (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Jul. 20, 2016
Oct. 23, 2015
Mar. 05, 2013
Debt Instrument [Line Items]          
Long-term Debt, Gross [1] $ 3,580        
Additional Credit Facilities         $ 500
Maximum | Required Covenant Ratio to Receive Additional Credit Facilities          
Debt Instrument [Line Items]          
Ratio of Indebtedness to Net Capital 3.50        
Ratio of Indebtedness to Net Capital Denominator 1.00        
Term Loan A          
Debt Instrument [Line Items]          
Debt Maturity 5 years        
Secured Debt | Term Loan A          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 391 [2] $ 413   $ 435  
Additional Credit Facilities       $ 500  
Secured Debt | Term Loan A | LIBOR | Greater than 3.50 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 2.50%        
Secured Debt | Term Loan A | LIBOR | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 2.25%        
Secured Debt | Term Loan A | LIBOR | Less than 2.50 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 2.00%        
Secured Debt | Term Loan A | ABR | Greater than 3.50 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 1.50%        
Secured Debt | Term Loan A | ABR | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 1.25%        
Secured Debt | Term Loan A | ABR | Less than 2.50 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 1.00%        
Secured Debt | Term Loan A | 2016          
Debt Instrument [Line Items]          
Annual percentage of original principal amount for quarterly amortization payments 5.00%        
Secured Debt | Term Loan A | 2017          
Debt Instrument [Line Items]          
Annual percentage of original principal amount for quarterly amortization payments 5.00%        
Secured Debt | Term Loan A | 2018          
Debt Instrument [Line Items]          
Annual percentage of original principal amount for quarterly amortization payments 7.50%        
Secured Debt | Term Loan A | 2019          
Debt Instrument [Line Items]          
Annual percentage of original principal amount for quarterly amortization payments 10.00%        
Secured Debt | Term Loan A | 2020          
Debt Instrument [Line Items]          
Annual percentage of original principal amount for quarterly amortization payments 12.50%        
Secured Debt | Term Loan A-1          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 342 [3] $ 351 $ 355    
Secured Debt | Term Loan A-1 | LIBOR | Greater than 3.50 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 2.50%        
Secured Debt | Term Loan A-1 | LIBOR | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 2.25%        
Secured Debt | Term Loan A-1 | LIBOR | Less than 2.50 to 1.00 but greater than or equal to 2.00 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 2.00%        
Secured Debt | Term Loan A-1 | LIBOR | Less than 2.00 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 1.75%        
Secured Debt | Term Loan A-1 | ABR | Greater than 3.50 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 1.50%        
Secured Debt | Term Loan A-1 | ABR | Less than or equal to 3.50 to 1.00 but greater than or equal to 2.50 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 1.25%        
Secured Debt | Term Loan A-1 | ABR | Less than 2.50 to 1.00 but greater than or equal to 2.00 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 1.00%        
Secured Debt | Term Loan A-1 | ABR | Less than 2.00 to 1.00          
Debt Instrument [Line Items]          
Debt Instrument, basis spread on variable rate 0.75%        
Secured Debt | Term Loan A-1 | 2017          
Debt Instrument [Line Items]          
Annual percentage of original principal amount for quarterly amortization payments 2.50%        
Secured Debt | Term Loan A-1 | 2018          
Debt Instrument [Line Items]          
Annual percentage of original principal amount for quarterly amortization payments 2.50%        
Secured Debt | Term Loan A-1 | 2019          
Debt Instrument [Line Items]          
Annual percentage of original principal amount for quarterly amortization payments 5.00%        
Secured Debt | Term Loan A-1 | 2020          
Debt Instrument [Line Items]          
Annual percentage of original principal amount for quarterly amortization payments 7.50%        
Secured Debt | Term Loan A-1 | 2021          
Debt Instrument [Line Items]          
Annual percentage of original principal amount for quarterly amortization payments 10.00%        
Secured Debt | Term Loan A Facility | Maximum | Required Covenant Ratio to Receive Additional Credit Facilities          
Debt Instrument [Line Items]          
Ratio of Indebtedness to Net Capital 350.00%        
Ratio of Indebtedness to Net Capital Denominator 100.00%        
[1] Not included in this table is the Company's Unsecured Letter of Credit Facility which had a capacity of $74 million with $69 million utilized at a weighted average rate of 3.24% at December 31, 2017.
[2] The Term Loan A provided for quarterly amortization payments, which commenced March 31, 2016, totaling per annum 5%, 5%, 7.5%, 10.0% and 12.5% of the original principal amount of the Term Loan A in 2016, 2017, 2018, 2019 and 2020, respectively. The interest rates with respect to term loans under the Term Loan A were based on, at the Company's option, (a) adjusted LIBOR plus an additional margin or (b) ABR plus an additional margin, in each case subject to adjustment based on the then current senior secured leverage ratio. Based on the previous quarter senior secured leverage ratio, the LIBOR margin was 2.00% and the ABR margin was 1.00% for the three months ended December 31, 2017. See Note 19, "Subsequent Events" for a description of the February 2018 refinancing.
[3] The Term Loan A-1 provided for quarterly amortization payments, which commenced on September 30, 2016, totaling per annum 2.5%, 2.5%, 5%, 7.5% and 10.0% of the original principal amount of the Term Loan A-1, with the last amortization payment made on June 30, 2021. The interest rates with respect to term loans under the Term Loan A-1 were based on, at the Company's option, (a) adjusted LIBOR plus an additional margin or (b) ABR plus an additional margin, in each case subject to adjustment based on the then current senior secured leverage ratio. Based on the previous quarter senior secured leverage ratio, the LIBOR margin was 2.00% and the ABR margin was 1.00% for the three months ended December 31, 2017. See Note 19, "Subsequent Events" for a description of the February 2018 refinancing.