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Note 1. Significant Accounting Policies VIE (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Entity
Sep. 30, 2016
USD ($)
Entity
Variable Interest Entity, Number of Entities | Entity 2 2
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 288 $ 326
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 169 219
Other Current Liabilities [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 169 219
Other Noncurrent Assets [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 56 45
Other Current Assets [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 232 $ 281