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Note 8. Short And Long-Term Debt Senior Secured Credit Facility (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Oct. 23, 2015
Dec. 31, 2014
Mar. 10, 2014
Mar. 05, 2013
Debt Instrument [Line Items]            
Letter of credit borrowing capacity   $ 125 $ 125      
Outstanding letter of credit   $ 134        
Additional Credit Facilities           $ 500
Scenario, Actual [Member]            
Debt Instrument [Line Items]            
Senior secured leverage ratio   2.58        
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        
Synthetic Letter of Credit Facility [Member]            
Debt Instrument [Line Items]            
Letter of credit borrowing capacity   $ 54        
Annual percentage of original principal amount for quarterly amortization payments 1.00%          
Outstanding letter of credit   $ 53   $ 53    
Revolving Credit Facility under Term Loan A Facility [Member]            
Debt Instrument [Line Items]            
Debt Maturity   5 years        
Term Loan B Facility | 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 Facility | ABR [Member]            
Debt Instrument [Line Items]            
Description of variable interest rate basis ABR          
Debt Instrument, basis spread on variable rate   2.00%        
Debt Instrument, basis spread on variable rate, floor   1.75%        
Secured Debt [Member] | Term Loan B Facility            
Debt Instrument [Line Items]            
Principal amount of long-term debt         $ 1,905  
Annual percentage of original principal amount for quarterly amortization payments   1.00%        
Line of Credit [Member] | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility borrowing capacity   $ 815 $ 815     $ 475
Line of Credit [Member] | Revolving Credit Facility | Greater than 3.50 to 1.00 [Member] | 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 [Member] | 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 [Member] | 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 [Member] | 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 [Member] | 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 [Member] | ABR [Member]            
Debt Instrument [Line Items]            
Debt Instrument, basis spread on variable rate   1.00%