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Proprietary Capital Proprietary Capital - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss)        
Net effect on earnings $ 0 $ 0    
Net unrealized gain (loss) on future cash flow hedges   10 $ 59 $ (139)
Reclassification to earnings from cash flow hedges   (26) $ 26 $ (129)
Reclassification to earnings from cash flow hedges in the next twelve months   $ (28)