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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, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward]        
Beginning balance     $ 212  
Ending balance $ 237 $ 202 237 $ 202
Redeemable Noncontrolling Interests [Member]        
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward]        
Beginning balance 216 209 212 194
Net income 11 12 31 31
Foreign currency translation adjustments 10 (20) 2 (20)
Realized and unrealized gains (losses) on derivatives 0 1 (2) 1
Dividends     (6) (4)
Ending balance $ 237 $ 202 $ 237 $ 202