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Note 2. Summary of Significant Accounting Policies Derivative Instruments (Details) - Interest rate swap contracts
$ in Millions
Dec. 31, 2016
USD ($)
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