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Note 2. Summary of Significant Accounting Policies Derivative Instruments (Details) - Interest rate swap contracts $ in Millions | Dec. 31, 2017 USD ($)
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Derivative [Line Items] |  |
Notional value of derivative instrument | $ 1,475 |
July 2012 |  |
Derivative [Line Items] |  |
Notional value of derivative instrument | 225 | [1],[2]
January 2013 |  |
Derivative [Line Items] |  |
Notional value of derivative instrument | 200 | [1],[2]
August 2015 |  |
Derivative [Line Items] |  |
Notional value of derivative instrument | 600 |
November 2017 |  |
Derivative [Line Items] |  |
Notional value of derivative instrument | 450 | [1],[2]
July 2012 and January 2013 |  |
Derivative [Line Items] |  |
Notional value of derivative instrument | $ 425 |
[1] | (a)Interest rates swaps with a notional value of $425 million expired February 10, 2018, and interest rate swaps with a notional value of $450 million commenced in the fourth quarter of 2017.
[2] | Interest rates swaps with a notional value of $425 million expired February 10, 2018, and interest rate swaps with a notional value of $450 million commenced in the fourth quarter of 2017.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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