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Note 2. Summary of Significant Accounting Policies Derivative Instruments (Details) $ in Millions	Dec. 31, 2015 USD ($)
Interest rate swap contracts | Swap [Member]
Derivative [Line Items]
Notional value of derivative instrument	$ 1,475
July 2012 [Member]
Derivative [Line Items]
Notional value of derivative instrument	225
January 2013 [Member]
Derivative [Line Items]
Notional value of derivative instrument	200
August 2015 [Member]
Derivative [Line Items]
Notional value of derivative instrument	600
November 2017 [Member]
Derivative [Line Items]
Notional value of derivative instrument	$ 450

X

- 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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X

- 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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- Details

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- Details

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- Details

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- Details

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- Details

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