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Note 9. Equity and Noncontrolling Interests (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes In Shareholder's Equity [Line Items]        
Stockholders' Equity Attributable to Parent $ 4,108   $ 4,279  
Stockholders' Equity Attributable to Noncontrolling Interest 321   313  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 4,429   4,592  
Net Income (Loss) Attributable to Parent (216) $ 142    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 76 (449)    
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders $ 8 0    
Non-cash Settlement With Parent   $ 1,500    
Dividends, Common Stock $ 0.275      
Common Stock, Dividends, Per Share, Declared $ 0.275 $ 0    
Common Stock [Member]        
Changes In Shareholder's Equity [Line Items]        
Stockholders' Equity Attributable to Parent $ 0 $ 0 0 $ 0
Net Income (Loss) Attributable to Parent 0 0    
Change In Parent Net Investment   0    
Proceeds from Contributions from Parent   0    
Reclass of Parent Net Investment And Issuance of Shares With Separation   0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 0    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 0 0    
Dividends 0      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 0 0    
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options 0      
Adjustments to Additional Paid in Capital, Other 0      
Noncontrolling Interest, Period Increase (Decrease)   0    
Additional Paid-in Capital [Member]        
Changes In Shareholder's Equity [Line Items]        
Stockholders' Equity Attributable to Parent 3,952 3,865 3,942 0
Net Income (Loss) Attributable to Parent 0 0    
Change In Parent Net Investment   0    
Proceeds from Contributions from Parent   228    
Reclass of Parent Net Investment And Issuance of Shares With Separation   3,637    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 0    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 0 0    
Dividends 0      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 0 0    
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options 6      
Adjustments to Additional Paid in Capital, Other 4      
Noncontrolling Interest, Period Increase (Decrease)   0    
Retained Earnings [Member]        
Changes In Shareholder's Equity [Line Items]        
Stockholders' Equity Attributable to Parent 492 77 734 0
Net Income (Loss) Attributable to Parent (216) 77    
Change In Parent Net Investment   0    
Proceeds from Contributions from Parent   0    
Reclass of Parent Net Investment And Issuance of Shares With Separation   0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 0    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 0 0    
Dividends (26)      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 0 0    
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options 0      
Adjustments to Additional Paid in Capital, Other 0      
Noncontrolling Interest, Period Increase (Decrease)   0    
Parent Net Investment [Member]        
Changes In Shareholder's Equity [Line Items]        
Stockholders' Equity Attributable to Parent 0 0 0 4,452
Net Income (Loss) Attributable to Parent 0 65    
Change In Parent Net Investment   (880)    
Proceeds from Contributions from Parent   0    
Reclass of Parent Net Investment And Issuance of Shares With Separation   (3,637)    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 0 0    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 0 0    
Dividends 0      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 0 0    
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options 0      
Adjustments to Additional Paid in Capital, Other 0      
Noncontrolling Interest, Period Increase (Decrease)   0    
AOCI Attributable to Parent [Member]        
Changes In Shareholder's Equity [Line Items]        
Stockholders' Equity Attributable to Parent (336) (725) (397) (276)
Net Income (Loss) Attributable to Parent 0 0    
Change In Parent Net Investment   0    
Proceeds from Contributions from Parent   0    
Reclass of Parent Net Investment And Issuance of Shares With Separation   0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax   (447)    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (10) (2)    
Dividends 0      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 0 0    
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options 0      
Adjustments to Additional Paid in Capital, Other 0      
Noncontrolling Interest, Period Increase (Decrease)   0    
Parent [Member]        
Changes In Shareholder's Equity [Line Items]        
Stockholders' Equity Attributable to Parent 4,108 3,217 4,279 4,176
Net Income (Loss) Attributable to Parent (216) 142    
Change In Parent Net Investment   (880)    
Proceeds from Contributions from Parent   228    
Reclass of Parent Net Investment And Issuance of Shares With Separation   0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 71 (447)    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (10) (2)    
Dividends (26)      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 0 0    
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options 6      
Adjustments to Additional Paid in Capital, Other 4      
Noncontrolling Interest, Period Increase (Decrease)   0    
Noncontrolling Interest [Member]        
Changes In Shareholder's Equity [Line Items]        
Stockholders' Equity Attributable to Noncontrolling Interest 321 133 313 131
Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable 13 17    
Change In Parent Net Investment   0    
Proceeds from Contributions from Parent   0    
Reclass of Parent Net Investment And Issuance of Shares With Separation   0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 4 (1)    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax 0 0    
Dividends 0      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (9) (16)    
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options 0      
Adjustments to Additional Paid in Capital, Other 0      
Noncontrolling Interest, Period Increase (Decrease)   2    
AOCI Including Portion Attributable to Noncontrolling Interest [Member]        
Changes In Shareholder's Equity [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 4,429 3,350 $ 4,592 $ 4,307
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest (203) 159    
Change In Parent Net Investment   (880)    
Proceeds from Contributions from Parent   228    
Reclass of Parent Net Investment And Issuance of Shares With Separation   0    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 75 (448)    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (10) (2)    
Dividends (26)      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (9) (16)    
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options 6      
Adjustments to Additional Paid in Capital, Other $ 4      
Noncontrolling Interest, Period Increase (Decrease)   $ 2