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Note 1. Significant Accounting Policies VIE (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Entity
Sep. 30, 2017
USD ($)
Variable Interest Entity, Number of Entities | Entity 2  
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 273 $ 288
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 159 169
Other Current Liabilities [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 159 169
Other Noncurrent Assets [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 63 56
Other Current Assets [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 210 $ 232