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Note 9, Equity and Noncontrolling Interests Changes in Equity and NCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Changes In Shareholder's Equity [Line Items]            
Stockholders' Equity Attributable to Parent $ 3,927   $ 3,927   $ 4,210  
Stockholders' Equity Attributable to Noncontrolling Interest 147   147   131  
Net Income (Loss) Attributable to Parent 204 $ (14) 545 $ (656)    
Foreign Currency Translation Adjustment 131 (85) (226) (52)    
Dividends Attributable to Noncontrolling Interest     (47) (34)    
Common Stock [Member]            
Changes In Shareholder's Equity [Line Items]            
Stockholders' Equity Attributable to Parent 0 0 0 0 0 $ 0
Net Income (Loss) Attributable to Parent     0 0    
Foreign Currency Translation Adjustment     0 0    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax     0 0    
Dividends     0      
Change In Parent Net Investment     0 0    
Noncontrolling Interest, Period Increase (Decrease)     0 0    
Dividends Attributable to Noncontrolling Interest     0 0    
Stock Repurchased During Period, Value     0      
Proceeds from Contributions from Parent     0      
Reclass of Parent Net Investment And Issuance of Shares With Separation     0      
Change in Noncontrolling Interest Share     0      
Additional Paid-in Capital [Member]            
Changes In Shareholder's Equity [Line Items]            
Stockholders' Equity Attributable to Parent 3,966 0 3,966 0 0 0
Net Income (Loss) Attributable to Parent     0 0    
Foreign Currency Translation Adjustment     0 0    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax     0 0    
Dividends     0      
Change In Parent Net Investment     0 0    
Noncontrolling Interest, Period Increase (Decrease)     0 0    
Dividends Attributable to Noncontrolling Interest     0 0    
Stock Repurchased During Period, Value     40      
Proceeds from Contributions from Parent     326      
Reclass of Parent Net Investment And Issuance of Shares With Separation     3,671      
Change in Noncontrolling Interest Share     9      
Retained Earnings [Member]            
Changes In Shareholder's Equity [Line Items]            
Stockholders' Equity Attributable to Parent 454 0 454 0 0 0
Net Income (Loss) Attributable to Parent     480 0    
Foreign Currency Translation Adjustment     0 0    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax     0 0    
Dividends     26      
Change In Parent Net Investment     0 0    
Noncontrolling Interest, Period Increase (Decrease)     0 0    
Dividends Attributable to Noncontrolling Interest     0 0    
Stock Repurchased During Period, Value     0      
Proceeds from Contributions from Parent     0      
Reclass of Parent Net Investment And Issuance of Shares With Separation     0      
Change in Noncontrolling Interest Share     0      
Parent Net Investment [Member]            
Changes In Shareholder's Equity [Line Items]            
Stockholders' Equity Attributable to Parent 0 5,137 0 5,137 4,486 5,873
Net Income (Loss) Attributable to Parent     65 (656)    
Foreign Currency Translation Adjustment     0 0    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax     0 0    
Dividends     0      
Change In Parent Net Investment     (880) (80)    
Noncontrolling Interest, Period Increase (Decrease)     0 0    
Dividends Attributable to Noncontrolling Interest     0 0    
Stock Repurchased During Period, Value     0      
Proceeds from Contributions from Parent     0      
Reclass of Parent Net Investment And Issuance of Shares With Separation     (3,671)      
Change in Noncontrolling Interest Share     0      
Parent [Member]            
Changes In Shareholder's Equity [Line Items]            
Stockholders' Equity Attributable to Parent 3,927 4,848 3,927 4,848 4,210 5,626
Net Income (Loss) Attributable to Parent     545 (656)    
Foreign Currency Translation Adjustment     (229) (54)    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax     12 12    
Dividends     26      
Change In Parent Net Investment     (880) (80)    
Noncontrolling Interest, Period Increase (Decrease)     0 0    
Dividends Attributable to Noncontrolling Interest     0 0    
Stock Repurchased During Period, Value     40      
Proceeds from Contributions from Parent     326      
Reclass of Parent Net Investment And Issuance of Shares With Separation     0      
Change in Noncontrolling Interest Share     9      
Noncontrolling Interest [Member]            
Changes In Shareholder's Equity [Line Items]            
Stockholders' Equity Attributable to Noncontrolling Interest 147 131 147 131 131 141
Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable     50 42    
Foreign Currency Translation Adjustment     2 1    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax     0 0    
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders     0      
Change In Parent Net Investment     0 0    
Noncontrolling Interest, Period Increase (Decrease)     5 2    
Dividends Attributable to Noncontrolling Interest     (41) (55)    
Stock Repurchased During Period, Value     0      
Proceeds from Contributions from Parent     0      
Reclass of Parent Net Investment And Issuance of Shares With Separation     0      
Change in Noncontrolling Interest Share     0      
AOCI Including Portion Attributable to Noncontrolling Interest [Member]            
Changes In Shareholder's Equity [Line Items]            
Stockholders' Equity Attributable to Parent 4,074 4,979 4,074 4,979 4,341 5,767
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest     595 (614)    
Foreign Currency Translation Adjustment     (227) (53)    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax     12 12    
Dividends     26      
Change In Parent Net Investment     (880) (80)    
Noncontrolling Interest, Period Increase (Decrease)     5 2    
Dividends Attributable to Noncontrolling Interest     (41) (55)    
Stock Repurchased During Period, Value     40      
Proceeds from Contributions from Parent     326      
Reclass of Parent Net Investment And Issuance of Shares With Separation     0      
Change in Noncontrolling Interest Share     9      
Other Comprehensive Income (Loss) [Member]            
Changes In Shareholder's Equity [Line Items]            
Stockholders' Equity Attributable to Parent (493) (289) (493) (289) $ (276) $ (247)
Net Income (Loss) Attributable to Parent     0 0    
Foreign Currency Translation Adjustment $ 130 $ (85) (229) (54)    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax     12 12    
Dividends     0      
Change In Parent Net Investment     0 0    
Noncontrolling Interest, Period Increase (Decrease)     0 0    
Dividends Attributable to Noncontrolling Interest     0 $ 0    
Stock Repurchased During Period, Value     0      
Proceeds from Contributions from Parent     0      
Reclass of Parent Net Investment And Issuance of Shares With Separation     0      
Change in Noncontrolling Interest Share     $ 0