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Equity and Noncontrolling Interests - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Foreign currency translation adjustments          
Balance at beginning of period $ (506) $ (534) $ (778) $ (785)  
Aggregate adjustment for the period 88 (471) 360 (220)  
Aggregate adjustment for period, tax effect 0 0 0 0  
Balance at end of period (418) (1,005) (418) (1,005)  
Realized and unrealized gains (losses) on derivatives          
Balance at beginning of period 3 3 2 (2)  
Current period change in fair value 5 (8) 7 (3)  
Current period change in fair value, Tax 2 (3) 4 (1)  
Reclassification to income [1] 1 (2) 0 (2)  
Reclassifcation to income, tax effect 0 0 0 0  
Balance at end of period 9 (7) 9 (7)  
Pension and postretirement plans          
Balance at beginning of period (1) (9) 0 (8)  
Reclassification to income 0 0 (1) (1)  
Reclassification to income, tax effect 0 0 0 0  
Balance at end of period (1) (9) (1) (9)  
Accumulated other comprehensive loss $ (410) $ (1,021) $ (410) $ (1,021) $ (776)
[1] Refer to Note 17, "Derivative Instruments and Hedging Activities," of the notes to consolidated financial statements for
disclosure of the line items in the consolidated statements of income affected by reclassifications from AOCI into income
related to derivatives.