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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% |  |  |  |

X
- Definition The amount of additional credit facilities permitted to be obtained by the Company under the Amended and Restated Credit Agreement if the Company's senior secured leverage ratio is less than 3.50 to 1.00 on a pro forma basis. + References No definition available. + Details
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