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Equity and Noncontrolling Interests - Changes in Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward]        
Realized and unrealized gains (losses) on derivatives $ 17 $ (10) $ 19 $ (11)
Parent        
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward]        
Realized and unrealized gains (losses) on derivatives $ 14 (6) $ 15 (5)
Redeemable Noncontrolling Interests [Member]        
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward]        
Beginning balance   226   211
Net income   12   25
Foreign currency translation adjustments   5   10
Realized and unrealized gains (losses) on derivatives   (5)   (8)
Dividends   (3)   (3)
Ending balance   $ 235   $ 235