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Nonconsolidated Partially-Owned Affiliates - Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]    
Current assets $ 4,482 $ 4,116
Current liabilities 3,819 3,835
Noncurrent liabilities 4,864 4,267
Noncontrolling interests 322 341
Equity method investment, nonconsolidated investee or group of investees    
Schedule of Equity Method Investments [Line Items]    
Current assets 4,222 7,122
Noncurrent assets 1,579 3,335
Current liabilities 4,213 7,058
Noncurrent liabilities 87 433
Noncontrolling interests $ 105 $ 125