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Note 1, Significant Accounting Policies (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2017
USD ($)
Entity
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Entity
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Oct. 31, 2016
shares
Sep. 30, 2016
USD ($)
Entity
shares
Variable Interest Entity, Number of Entities | Entity 2   2     2
Common Stock, Shares Authorized | shares 500,000,000   500,000,000     0
Preferred Stock, Shares Authorized | shares 100,000,000   100,000,000      
Preferred Stock, Par or Stated Value Per Share | $ / shares $ 0.001   $ 0.001      
Restricted Cash and Cash Equivalents           $ 2,000
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 263   $ 263     326
Net Income (Loss) Attributable to Parent $ 204 $ (14) $ 545 $ (656)    
Weighted Average Number of Shares Outstanding, Basic | shares 93,400,000 93,700,000 93,600,000 93,700,000    
Dilutive Securities, Effect on Basic Earnings Per Share | shares 500,000 0 400,000 0    
Weighted Average Number of Shares Outstanding, Diluted | shares 93,900,000 93,700,000 94,000,000 93,700,000    
Earnings Per Share, Basic | $ / shares $ 2.18 $ (0.15) $ 5.82 $ (7.00)    
Earnings Per Share, Diluted | $ / shares $ 2.17 $ (0.15) $ 5.80 $ (7.00)    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities $ 173   $ 173     $ 219
Escrow Deposit     $ 2,000      
Common Stock, Shares, Issued | shares 93,126,722   93,126,722   93,671,810 0
Long-term Debt [Member]            
Cumulative Effect of New Accounting Principle in Period of Adoption           $ 43
Equity [Member]            
Cumulative Effect of New Accounting Principle in Period of Adoption           61
Other Current Assets [Member]            
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 213   $ 213     281
Other Noncurrent Assets [Member]            
Cumulative Effect of New Accounting Principle in Period of Adoption           43
Variable Interest Entity, Consolidated, Carrying Amount, Assets 50   50     45
Other Current Liabilities [Member]            
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities $ 173   $ 173     $ 219