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Basis of Presentation and Summary of Significant Accounting Policies - VIE (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Variable Interest Entity [Line Items]      
Current assets $ 4,482 $ 4,116  
Total assets 10,261 10,342 $ 10,942
Current liabilities 3,819 3,835  
Noncurrent liabilities 4,864 4,267  
Variable interest entity, primary beneficiary      
Variable Interest Entity [Line Items]      
Current assets 217 236  
Noncurrent assets 74 40  
Total assets 291 276  
Current liabilities 204 235  
Noncurrent liabilities 10 0  
Total liabilities $ 214 $ 235