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Income Taxes Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Beginning balance   $ 1,159 $ 1,607 $ 1,302
Additions for tax positions related to the current year   465 329 315
Additions for tax positions of prior years   15 23 31
Reductions for tax positions of prior years   (66) (118) (27)
Settlements with taxing authorities   (104) (541) (9)
Statute closings   (30) (18) (5)
Audit Resolutions $ (99) 0 123 0
Ending balance $ 1,159 1,836 1,159 1,607
Unrecognized Tax Benefits, Increase Resulting from Acquisition   $ 397 $ 0 $ 0