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Note 1. Significant Accounting Policies (Details)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Dec. 31, 2017
USD ($)
Entity
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Weighted Average Number of Shares Outstanding, Diluted | shares 93.2 93.9  
Net Cash Provided by (Used in) Operating Activities $ (127) $ (13)  
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest (130) (287)  
Gross Profit 202 350  
Income (Loss) from Equity Method Investments 96 94  
Income (Loss) from Continuing Operations before Interest Expense, Interest Income, Income Taxes, Noncontrolling Interests, Net 102 227  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 69 192  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest (196) 164  
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions $ (90) (72)  
Variable Interest Entity, Number of Entities | Entity 2    
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 273   $ 288
Net Income (Loss) Attributable to Parent $ (216) $ 142  
Weighted Average Number of Shares Outstanding, Basic | shares 93.2 93.7  
Earnings Per Share, Basic | $ / shares $ (2.32) $ 1.52  
Earnings Per Share, Diluted | $ / shares $ (2.32) $ 1.51  
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities $ 159   169
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (155) $ (307)  
Other Current Assets [Member]      
Variable Interest Entity, Consolidated, Carrying Amount, Assets 210   232
Other Noncurrent Assets [Member]      
Variable Interest Entity, Consolidated, Carrying Amount, Assets 63   56
Other Current Liabilities [Member]      
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities $ 159   $ 169
Scenario, Previously Reported [Member]      
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest   (280)  
Gross Profit   350  
Income (Loss) from Equity Method Investments   101  
Income (Loss) from Continuing Operations before Interest Expense, Interest Income, Income Taxes, Noncontrolling Interests, Net   234  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest   199  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   171  
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions   (79)  
Net Income (Loss) Attributable to Parent   $ 149  
Earnings Per Share, Basic | $ / shares   $ 1.59  
Earnings Per Share, Diluted | $ / shares   $ 1.59  
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   $ (300)  
Restatement Adjustment [Member]      
Net Cash Provided by (Used in) Operating Activities   0  
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest   (7)  
Gross Profit   0  
Income (Loss) from Equity Method Investments   (7)  
Income (Loss) from Continuing Operations before Interest Expense, Interest Income, Income Taxes, Noncontrolling Interests, Net   (7)  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest   (7)  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   (7)  
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions   7  
Net Income (Loss) Attributable to Parent   $ (7)  
Earnings Per Share, Basic | $ / shares   $ (0.07)  
Earnings Per Share, Diluted | $ / shares   $ (0.08)  
Comprehensive Income (Loss), Net of Tax, Attributable to Parent   $ (7)